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87=7d+24
We move all terms to the left:
87-(7d+24)=0
We get rid of parentheses
-7d-24+87=0
We add all the numbers together, and all the variables
-7d+63=0
We move all terms containing d to the left, all other terms to the right
-7d=-63
d=-63/-7
d=+9
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