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-130-d=-11d
We move all terms to the left:
-130-d-(-11d)=0
We add all the numbers together, and all the variables
-1d-(-11d)-130=0
We get rid of parentheses
-1d+11d-130=0
We add all the numbers together, and all the variables
10d-130=0
We move all terms containing d to the left, all other terms to the right
10d=130
d=130/10
d=13
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