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3d-(d+11)=13
We move all terms to the left:
3d-(d+11)-(13)=0
We get rid of parentheses
3d-d-11-13=0
We add all the numbers together, and all the variables
2d-24=0
We move all terms containing d to the left, all other terms to the right
2d=24
d=24/2
d=12
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