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20=12+2g
We move all terms to the left:
20-(12+2g)=0
We add all the numbers together, and all the variables
-(2g+12)+20=0
We get rid of parentheses
-2g-12+20=0
We add all the numbers together, and all the variables
-2g+8=0
We move all terms containing g to the left, all other terms to the right
-2g=-8
g=-8/-2
g=+4
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