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-8+d=-2d+7
We move all terms to the left:
-8+d-(-2d+7)=0
We get rid of parentheses
d+2d-7-8=0
We add all the numbers together, and all the variables
3d-15=0
We move all terms containing d to the left, all other terms to the right
3d=15
d=15/3
d=5
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