$\"\"$

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The given equation is $\"\"$

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

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$\"\"$ (Multiply: 4(3) =12)

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$\"\"$ (Subtract 4d from each side)

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$\"\"$ (Using commutative property: a + b = b + a)

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

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$\"\"$ (Subtract 17 from each side)

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

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$\"\"$ \ \

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Verify:

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

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$\"\"$

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$\"\"$ (Add: $\"\"$ )

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

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

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

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$\"\"$

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The value of d is $\"\"$ .

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