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