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5x+12=-3x+80
We move all terms to the left:
5x+12-(-3x+80)=0
We get rid of parentheses
5x+3x-80+12=0
We add all the numbers together, and all the variables
8x-68=0
We move all terms containing x to the left, all other terms to the right
8x=68
x=68/8
x=8+1/2
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