x-40=3x-120

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Solution for x-40=3x-120 equation: 



x-40=3x-120

We move all terms to the left:

x-40-(3x-120)=0

We get rid of parentheses

x-3x+120-40=0

We add all the numbers together, and all the variables

-2x+80=0

We move all terms containing x to the left, all other terms to the right

-2x=-80

x=-80/-2

x=+40

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