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

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The equation is $\"\"$

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According to subtraction property of equality:if $\"\"$ then $\"\"$ .

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$\"\"$ (Subtract 19 from each side)

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Combine like terms using commutative property of addition

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$\"\"$

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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

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Check:

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

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$\"\"$ (Substitute $\"\"$ )

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

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Compare the values, the equation is true. The solution is $\"\"$ . $\"\"$

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The value of $\"\"$ .