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15x+8=-3x+80
We move all terms to the left:
15x+8-(-3x+80)=0
We get rid of parentheses
15x+3x-80+8=0
We add all the numbers together, and all the variables
18x-72=0
We move all terms containing x to the left, all other terms to the right
18x=72
x=72/18
x=4
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