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640=60d+100
We move all terms to the left:
640-(60d+100)=0
We get rid of parentheses
-60d-100+640=0
We add all the numbers together, and all the variables
-60d+540=0
We move all terms containing d to the left, all other terms to the right
-60d=-540
d=-540/-60
d=+9
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