4x-9=-21+3x

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



4x-9=-21+3x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

4x-3x+21-9=0

We add all the numbers together, and all the variables

x+12=0

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

x=-12

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