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120+4x=50+5x
We move all terms to the left:
120+4x-(50+5x)=0
We add all the numbers together, and all the variables
4x-(5x+50)+120=0
We get rid of parentheses
4x-5x-50+120=0
We add all the numbers together, and all the variables
-1x+70=0
We move all terms containing x to the left, all other terms to the right
-x=-70
x=-70/-1
x=+70
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