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-35=7d-2d
We move all terms to the left:
-35-(7d-2d)=0
We add all the numbers together, and all the variables
-(+5d)-35=0
We get rid of parentheses
-5d-35=0
We move all terms containing d to the left, all other terms to the right
-5d=35
d=35/-5
d=-7
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