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66=6+4d
We move all terms to the left:
66-(6+4d)=0
We add all the numbers together, and all the variables
-(4d+6)+66=0
We get rid of parentheses
-4d-6+66=0
We add all the numbers together, and all the variables
-4d+60=0
We move all terms containing d to the left, all other terms to the right
-4d=-60
d=-60/-4
d=+15
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