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8.2g-12.78=8.1g-13.65
We move all terms to the left:
8.2g-12.78-(8.1g-13.65)=0
We get rid of parentheses
8.2g-8.1g+13.65-12.78=0
We add all the numbers together, and all the variables
0.1g+0.87=0
We move all terms containing g to the left, all other terms to the right
0.1g=-0.87
g=-0.87/0.1
g=-8+0.07/0.1
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