20=40-4x

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Solution for 20=40-4x equation: 



20=40-4x

We move all terms to the left:

20-(40-4x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4x-40+20=0

We add all the numbers together, and all the variables

4x-20=0

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

4x=20

x=20/4

x=5

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