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15-(4d+3)=12
We simplify the equation to the form, which is simple to understand
15-(4d+3)=12
Remove unnecessary parentheses
15-4d-3=12
We move all terms containing d to the left and all other terms to the right.
-4d=+12-15+3
We simplify left and right side of the equation.
-4d=0
We divide both sides of the equation by -4 to get d.
d=-0
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