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78=2g+20
We move all terms to the left:
78-(2g+20)=0
We get rid of parentheses
-2g-20+78=0
We add all the numbers together, and all the variables
-2g+58=0
We move all terms containing g to the left, all other terms to the right
-2g=-58
g=-58/-2
g=+29
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