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12.99=2g+3.81
We move all terms to the left:
12.99-(2g+3.81)=0
We get rid of parentheses
-2g-3.81+12.99=0
We add all the numbers together, and all the variables
-2g+9.18=0
We move all terms containing g to the left, all other terms to the right
-2g=-9.18
g=-9.18/-2
g=4+1/1.6949152542373
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