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-3.5g+5+2.7g=12.7
We move all terms to the left:
-3.5g+5+2.7g-(12.7)=0
We add all the numbers together, and all the variables
-0.8g-7.7=0
We move all terms containing g to the left, all other terms to the right
-0.8g=7.7
g=7.7/-0.8
g=-9+0.5/0.8
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