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-9(g-90)=-90
We move all terms to the left:
-9(g-90)-(-90)=0
We add all the numbers together, and all the variables
-9(g-90)+90=0
We multiply parentheses
-9g+810+90=0
We add all the numbers together, and all the variables
-9g+900=0
We move all terms containing g to the left, all other terms to the right
-9g=-900
g=-900/-9
g=+100
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