x+20=4x-40

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Solution for x+20=4x-40 equation: 



x+20=4x-40

We move all terms to the left:

x+20-(4x-40)=0

We get rid of parentheses

x-4x+40+20=0

We add all the numbers together, and all the variables

-3x+60=0

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

-3x=-60

x=-60/-3

x=+20

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