120=x+40

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Solution for 120=x+40 equation: 



120=x+40

We move all terms to the left:

120-(x+40)=0

We get rid of parentheses

-x-40+120=0

We add all the numbers together, and all the variables

-1x+80=0

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

-x=-80

x=-80/-1

x=+80

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