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(6d+7)+(9d-7)=180
We move all terms to the left:
(6d+7)+(9d-7)-(180)=0
We get rid of parentheses
6d+9d+7-7-180=0
We add all the numbers together, and all the variables
15d-180=0
We move all terms containing d to the left, all other terms to the right
15d=180
d=180/15
d=12
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