120+x=240+4x

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Solution for 120+x=240+4x equation: 



120+x=240+4x

We move all terms to the left:

120+x-(240+4x)=0

We add all the numbers together, and all the variables

x-(4x+240)+120=0

We get rid of parentheses

x-4x-240+120=0

We add all the numbers together, and all the variables

-3x-120=0

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

-3x=120

x=120/-3

x=-40

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