21=9-4x

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Solution for 21=9-4x equation: 



21=9-4x

We move all terms to the left:

21-(9-4x)=0

We add all the numbers together, and all the variables

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

We get rid of parentheses

4x-9+21=0

We add all the numbers together, and all the variables

4x+12=0

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

4x=-12

x=-12/4

x=-3

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