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3(d-)=2d+7
We move all terms to the left:
3(d-)-(2d+7)=0
We add all the numbers together, and all the variables
3(+d)-(2d+7)=0
We multiply parentheses
3d-(2d+7)=0
We get rid of parentheses
3d-2d-7=0
We add all the numbers together, and all the variables
d-7=0
We move all terms containing d to the left, all other terms to the right
d=7
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