-4x+9=-9x-21

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



-4x+9=-9x-21

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

5x+30=0

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

5x=-30

x=-30/5

x=-6

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