400=40x+80

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Solution for 400=40x+80 equation: 



400=40x+80

We move all terms to the left:

400-(40x+80)=0

We get rid of parentheses

-40x-80+400=0

We add all the numbers together, and all the variables

-40x+320=0

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

-40x=-320

x=-320/-40

x=+8

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