40=x-40

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Solution for 40=x-40 equation: 



40=x-40

We move all terms to the left:

40-(x-40)=0

We get rid of parentheses

-x+40+40=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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