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12.91=2g+3.87
We move all terms to the left:
12.91-(2g+3.87)=0
We get rid of parentheses
-2g-3.87+12.91=0
We add all the numbers together, and all the variables
-2g+9.04=0
We move all terms containing g to the left, all other terms to the right
-2g=-9.04
g=-9.04/-2
g=4+1/1.9230769230769
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