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42.12=9g+3.96
We move all terms to the left:
42.12-(9g+3.96)=0
We get rid of parentheses
-9g-3.96+42.12=0
We add all the numbers together, and all the variables
-9g+38.16=0
We move all terms containing g to the left, all other terms to the right
-9g=-38.16
g=-38.16/-9
g=4+2.16/9
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