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20.91=4g+3.99
We move all terms to the left:
20.91-(4g+3.99)=0
We get rid of parentheses
-4g-3.99+20.91=0
We add all the numbers together, and all the variables
-4g+16.92=0
We move all terms containing g to the left, all other terms to the right
-4g=-16.92
g=-16.92/-4
g=4+0.92/4
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