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-15-5d=-7d+11
We move all terms to the left:
-15-5d-(-7d+11)=0
We get rid of parentheses
-5d+7d-11-15=0
We add all the numbers together, and all the variables
2d-26=0
We move all terms containing d to the left, all other terms to the right
2d=26
d=26/2
d=13
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