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13d+8=7d+3d+35
We move all terms to the left:
13d+8-(7d+3d+35)=0
We add all the numbers together, and all the variables
13d-(10d+35)+8=0
We get rid of parentheses
13d-10d-35+8=0
We add all the numbers together, and all the variables
3d-27=0
We move all terms containing d to the left, all other terms to the right
3d=27
d=27/3
d=9
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