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-3.5d=-12.2d+8.7
We move all terms to the left:
-3.5d-(-12.2d+8.7)=0
We get rid of parentheses
-3.5d+12.2d-8.7=0
We add all the numbers together, and all the variables
8.7d-8.7=0
We move all terms containing d to the left, all other terms to the right
8.7d=8.7
d=8.7/8.7
d=1
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