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90=7d+6
We move all terms to the left:
90-(7d+6)=0
We get rid of parentheses
-7d-6+90=0
We add all the numbers together, and all the variables
-7d+84=0
We move all terms containing d to the left, all other terms to the right
-7d=-84
d=-84/-7
d=+12
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