21=6-4x+x

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Solution for 21=6-4x+x equation: 



21=6-4x+x

We move all terms to the left:

21-(6-4x+x)=0

We add all the numbers together, and all the variables

-(-3x+6)+21=0

We get rid of parentheses

3x-6+21=0

We add all the numbers together, and all the variables

3x+15=0

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

3x=-15

x=-15/3

x=-5

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