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37=15+2d
We move all terms to the left:
37-(15+2d)=0
We add all the numbers together, and all the variables
-(2d+15)+37=0
We get rid of parentheses
-2d-15+37=0
We add all the numbers together, and all the variables
-2d+22=0
We move all terms containing d to the left, all other terms to the right
-2d=-22
d=-22/-2
d=+11
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