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13x-70=20+10x
We move all terms to the left:
13x-70-(20+10x)=0
We add all the numbers together, and all the variables
13x-(10x+20)-70=0
We get rid of parentheses
13x-10x-20-70=0
We add all the numbers together, and all the variables
3x-90=0
We move all terms containing x to the left, all other terms to the right
3x=90
x=90/3
x=30
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