-9-4x=-21-7x

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Solution for -9-4x=-21-7x equation: 



-9-4x=-21-7x

We move all terms to the left:

-9-4x-(-21-7x)=0

We add all the numbers together, and all the variables

-4x-(-7x-21)-9=0

We get rid of parentheses

-4x+7x+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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