-21=x-4x-9

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Solution for -21=x-4x-9 equation: 



-21=x-4x-9

We move all terms to the left:

-21-(x-4x-9)=0

We add all the numbers together, and all the variables

-(-3x-9)-21=0

We get rid of parentheses

3x+9-21=0

We add all the numbers together, and all the variables

3x-12=0

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

3x=12

x=12/3

x=4

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