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8+5(2g-4)=-42
We move all terms to the left:
8+5(2g-4)-(-42)=0
We add all the numbers together, and all the variables
5(2g-4)+50=0
We multiply parentheses
10g-20+50=0
We add all the numbers together, and all the variables
10g+30=0
We move all terms containing g to the left, all other terms to the right
10g=-30
g=-30/10
g=-3
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