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13.15=2g+3.81
We move all terms to the left:
13.15-(2g+3.81)=0
We get rid of parentheses
-2g-3.81+13.15=0
We add all the numbers together, and all the variables
-2g+9.34=0
We move all terms containing g to the left, all other terms to the right
-2g=-9.34
g=-9.34/-2
g=4+1/1.4925373134328
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