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5d+1=3d+13
We move all terms to the left:
5d+1-(3d+13)=0
We get rid of parentheses
5d-3d-13+1=0
We add all the numbers together, and all the variables
2d-12=0
We move all terms containing d to the left, all other terms to the right
2d=12
d=12/2
d=6
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