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x+70=250+3x
We move all terms to the left:
x+70-(250+3x)=0
We add all the numbers together, and all the variables
x-(3x+250)+70=0
We get rid of parentheses
x-3x-250+70=0
We add all the numbers together, and all the variables
-2x-180=0
We move all terms containing x to the left, all other terms to the right
-2x=180
x=180/-2
x=-90
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