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13d-4=3+10d+7
We move all terms to the left:
13d-4-(3+10d+7)=0
We add all the numbers together, and all the variables
13d-(10d+10)-4=0
We get rid of parentheses
13d-10d-10-4=0
We add all the numbers together, and all the variables
3d-14=0
We move all terms containing d to the left, all other terms to the right
3d=14
d=14/3
d=4+2/3
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