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20+15d-20=14d-7
We move all terms to the left:
20+15d-20-(14d-7)=0
We add all the numbers together, and all the variables
15d-(14d-7)=0
We get rid of parentheses
15d-14d+7=0
We add all the numbers together, and all the variables
d+7=0
We move all terms containing d to the left, all other terms to the right
d=-7
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