-x=21-4x

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Solution for -x=21-4x equation: 



-x=21-4x

We move all terms to the left:

-x-(21-4x)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1x-(-4x+21)=0

We get rid of parentheses

-1x+4x-21=0

We add all the numbers together, and all the variables

3x-21=0

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

3x=21

x=21/3

x=7

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