-3x-9=21-4x

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Solution for -3x-9=21-4x equation: 



-3x-9=21-4x

We move all terms to the left:

-3x-9-(21-4x)=0

We add all the numbers together, and all the variables

-3x-(-4x+21)-9=0

We get rid of parentheses

-3x+4x-21-9=0

We add all the numbers together, and all the variables

x-30=0

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

x=30

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