40=x+80

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Solution for 40=x+80 equation: 



40=x+80

We move all terms to the left:

40-(x+80)=0

We get rid of parentheses

-x-80+40=0

We add all the numbers together, and all the variables

-1x-40=0

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

-x=40

x=40/-1

x=-40

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