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12.15=2g+3.89
We move all terms to the left:
12.15-(2g+3.89)=0
We get rid of parentheses
-2g-3.89+12.15=0
We add all the numbers together, and all the variables
-2g+8.26=0
We move all terms containing g to the left, all other terms to the right
-2g=-8.26
g=-8.26/-2
g=4+0.26/2
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