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35=4d+3d
We move all terms to the left:
35-(4d+3d)=0
We add all the numbers together, and all the variables
-(+7d)+35=0
We get rid of parentheses
-7d+35=0
We move all terms containing d to the left, all other terms to the right
-7d=-35
d=-35/-7
d=+5
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