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8x-70=3x+20
We move all terms to the left:
8x-70-(3x+20)=0
We get rid of parentheses
8x-3x-20-70=0
We add all the numbers together, and all the variables
5x-90=0
We move all terms containing x to the left, all other terms to the right
5x=90
x=90/5
x=18
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