7x-120=3x-40

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



7x-120=3x-40

We move all terms to the left:

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

We get rid of parentheses

7x-3x+40-120=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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