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(10d-9)+(6d+9)=180
We move all terms to the left:
(10d-9)+(6d+9)-(180)=0
We get rid of parentheses
10d+6d-9+9-180=0
We add all the numbers together, and all the variables
16d-180=0
We move all terms containing d to the left, all other terms to the right
16d=180
d=180/16
d=11+1/4
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