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(6d+7)+90+9d-7)=180
We move all terms to the left:
(6d+7)+90+9d-7)-(180)=0
We add all the numbers together, and all the variables
9d+(6d+7)=0
We get rid of parentheses
9d+6d+7=0
We add all the numbers together, and all the variables
15d+7=0
We move all terms containing d to the left, all other terms to the right
15d=-7
d=-7/15
d=-7/15
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