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(6d+8)+(8d+4)=180
We move all terms to the left:
(6d+8)+(8d+4)-(180)=0
We get rid of parentheses
6d+8d+8+4-180=0
We add all the numbers together, and all the variables
14d-168=0
We move all terms containing d to the left, all other terms to the right
14d=168
d=168/14
d=12
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