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-d-4=d+84
We move all terms to the left:
-d-4-(d+84)=0
We add all the numbers together, and all the variables
-1d-(d+84)-4=0
We get rid of parentheses
-1d-d-84-4=0
We add all the numbers together, and all the variables
-2d-88=0
We move all terms containing d to the left, all other terms to the right
-2d=88
d=88/-2
d=-44
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