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13d+3=7d+51
We move all terms to the left:
13d+3-(7d+51)=0
We get rid of parentheses
13d-7d-51+3=0
We add all the numbers together, and all the variables
6d-48=0
We move all terms containing d to the left, all other terms to the right
6d=48
d=48/6
d=8
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