120-x=40+x

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Solution for 120-x=40+x equation: 



120-x=40+x

We move all terms to the left:

120-x-(40+x)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1x-(x+40)+120=0

We get rid of parentheses

-1x-x-40+120=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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