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-12x-70+72x=15x+20
We move all terms to the left:
-12x-70+72x-(15x+20)=0
We add all the numbers together, and all the variables
60x-(15x+20)-70=0
We get rid of parentheses
60x-15x-20-70=0
We add all the numbers together, and all the variables
45x-90=0
We move all terms containing x to the left, all other terms to the right
45x=90
x=90/45
x=2
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