2x+9=-4x-21

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



2x+9=-4x-21

We move all terms to the left:

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

We get rid of parentheses

2x+4x+21+9=0

We add all the numbers together, and all the variables

6x+30=0

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

6x=-30

x=-30/6

x=-5

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