$\"\"$ $\"\"$

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The equation is $\"\"$

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$\"\"$ (Distributive property:a(b + c) = ab + ac)

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$

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According to addition property of equality: if a = b, then a + c = b + c.

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$\"\"$ (Add 10a to each side)

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$\"\"$ (Commutative property: a + b = b + a)

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Add: 8a+10a=18a)

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$\"\"$ (Additive identity property: a + 0 = a)

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$\"\"$

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According to addition property of equality: if a = b, then a + c = b + c.

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$\"\"$ (Add 4 to each side)

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$\"\"$ (Additive inverse property: $\"\"$ )

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$\"\"$ (Add: 50 + 4 = 54)

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$\"\"$ (Additive identity property: a + 0 = a) $\"\"$

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$\"\"$ (Divide each side by 18)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ ) $\"\"$

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Verify the solution:

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To check the solution, substitute $\"\"$ in original equation.

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$\"\"$

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$ (Multiply: $\"\"$ )

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Compare the values, the equation is true.

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$\"\"$

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The value of $\"\"$ .