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13+2d=5d+104
We move all terms to the left:
13+2d-(5d+104)=0
We get rid of parentheses
2d-5d-104+13=0
We add all the numbers together, and all the variables
-3d-91=0
We move all terms containing d to the left, all other terms to the right
-3d=91
d=91/-3
d=-30+1/3
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