-3x-9=6-21

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Solution for -3x-9=6-21 equation: 



-3x-9=6-21

We move all terms to the left:

-3x-9-(6-21)=0

We add all the numbers together, and all the variables

-3x-9-(-15)=0

We add all the numbers together, and all the variables

-3x+6=0

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

-3x=-6

x=-6/-3

x=+2

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