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-3.8g+5+2.8g=12.7
We move all terms to the left:
-3.8g+5+2.8g-(12.7)=0
We add all the numbers together, and all the variables
-1g-7.7=0
We move all terms containing g to the left, all other terms to the right
-g=7.7
g=7.7/-1
g=-7+0.7/1
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