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(4g+20)+(5g-2)=90
We move all terms to the left:
(4g+20)+(5g-2)-(90)=0
We get rid of parentheses
4g+5g+20-2-90=0
We add all the numbers together, and all the variables
9g-72=0
We move all terms containing g to the left, all other terms to the right
9g=72
g=72/9
g=8
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