3x-40=7x-120

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Solution for 3x-40=7x-120 equation: 



3x-40=7x-120

We move all terms to the left:

3x-40-(7x-120)=0

We get rid of parentheses

3x-7x+120-40=0

We add all the numbers together, and all the variables

-4x+80=0

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

-4x=-80

x=-80/-4

x=+20

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