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-103=9d-13
We move all terms to the left:
-103-(9d-13)=0
We get rid of parentheses
-9d+13-103=0
We add all the numbers together, and all the variables
-9d-90=0
We move all terms containing d to the left, all other terms to the right
-9d=90
d=90/-9
d=-10
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