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7=d-13-2
We move all terms to the left:
7-(d-13-2)=0
We add all the numbers together, and all the variables
-(d-15)+7=0
We get rid of parentheses
-d+15+7=0
We add all the numbers together, and all the variables
-1d+22=0
We move all terms containing d to the left, all other terms to the right
-d=-22
d=-22/-1
d=+22
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