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11d+2d+3+4d-15d=20
We move all terms to the left:
11d+2d+3+4d-15d-(20)=0
We add all the numbers together, and all the variables
2d-17=0
We move all terms containing d to the left, all other terms to the right
2d=17
d=17/2
d=8+1/2
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