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

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



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

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

2x+12=0

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

2x=-12

x=-12/2

x=-6

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