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87=3g+18
We move all terms to the left:
87-(3g+18)=0
We get rid of parentheses
-3g-18+87=0
We add all the numbers together, and all the variables
-3g+69=0
We move all terms containing g to the left, all other terms to the right
-3g=-69
g=-69/-3
g=+23
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