7+x=4x-20

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Solution for 7+x=4x-20 equation: 



7+x=4x-20

We move all terms to the left:

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

We get rid of parentheses

x-4x+20+7=0

We add all the numbers together, and all the variables

-3x+27=0

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

-3x=-27

x=-27/-3

x=+9

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