-21+4x=x-4x

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Solution for -21+4x=x-4x equation: 



-21+4x=x-4x

We move all terms to the left:

-21+4x-(x-4x)=0

We add all the numbers together, and all the variables

4x-(-3x)-21=0

We get rid of parentheses

4x+3x-21=0

We add all the numbers together, and all the variables

7x-21=0

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

7x=21

x=21/7

x=3

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