-9-x=-21-4x

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



-9-x=-21-4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1x-(-4x-21)-9=0

We get rid of parentheses

-1x+4x+21-9=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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