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(3d+5)+(d+7)=90
We move all terms to the left:
(3d+5)+(d+7)-(90)=0
We get rid of parentheses
3d+d+5+7-90=0
We add all the numbers together, and all the variables
4d-78=0
We move all terms containing d to the left, all other terms to the right
4d=78
d=78/4
d=19+1/2
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