120-2x=x

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Solution for 120-2x=x equation: 



120-2x=x

We move all terms to the left:

120-2x-(x)=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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