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15d+2=13+14d
We move all terms to the left:
15d+2-(13+14d)=0
We add all the numbers together, and all the variables
15d-(14d+13)+2=0
We get rid of parentheses
15d-14d-13+2=0
We add all the numbers together, and all the variables
d-11=0
We move all terms containing d to the left, all other terms to the right
d=11
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