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25+14g=21g-122
We move all terms to the left:
25+14g-(21g-122)=0
We get rid of parentheses
14g-21g+122+25=0
We add all the numbers together, and all the variables
-7g+147=0
We move all terms containing g to the left, all other terms to the right
-7g=-147
g=-147/-7
g=+21
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