4x-9=-2x-21

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Solution for 4x-9=-2x-21 equation: 



4x-9=-2x-21

We move all terms to the left:

4x-9-(-2x-21)=0

We get rid of parentheses

4x+2x+21-9=0

We add all the numbers together, and all the variables

6x+12=0

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

6x=-12

x=-12/6

x=-2

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