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20+3g-5g=-4g-18
We move all terms to the left:
20+3g-5g-(-4g-18)=0
We add all the numbers together, and all the variables
-2g-(-4g-18)+20=0
We get rid of parentheses
-2g+4g+18+20=0
We add all the numbers together, and all the variables
2g+38=0
We move all terms containing g to the left, all other terms to the right
2g=-38
g=-38/2
g=-19
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