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(2d-8)+(d-12)=13
We move all terms to the left:
(2d-8)+(d-12)-(13)=0
We get rid of parentheses
2d+d-8-12-13=0
We add all the numbers together, and all the variables
3d-33=0
We move all terms containing d to the left, all other terms to the right
3d=33
d=33/3
d=11
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