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(5g+18)+(5g+18)=17g-20
We move all terms to the left:
(5g+18)+(5g+18)-(17g-20)=0
We get rid of parentheses
5g+5g-17g+18+18+20=0
We add all the numbers together, and all the variables
-7g+56=0
We move all terms containing g to the left, all other terms to the right
-7g=-56
g=-56/-7
g=+8
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