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55=-15+-16+2d
We move all terms to the left:
55-(-15+-16+2d)=0
We add all the numbers together, and all the variables
-(2d-31)+55=0
We get rid of parentheses
-2d+31+55=0
We add all the numbers together, and all the variables
-2d+86=0
We move all terms containing d to the left, all other terms to the right
-2d=-86
d=-86/-2
d=+43
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