400=3x-20

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Solution for 400=3x-20 equation: 



400=3x-20

We move all terms to the left:

400-(3x-20)=0

We get rid of parentheses

-3x+20+400=0

We add all the numbers together, and all the variables

-3x+420=0

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

-3x=-420

x=-420/-3

x=+140

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