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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

3(-1x-3)+x-3-(-21)=0

We add all the numbers together, and all the variables

x+3(-1x-3)+18=0

We multiply parentheses

x-3x-9+18=0

We add all the numbers together, and all the variables

-2x+9=0

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

-2x=-9

x=-9/-2

x=4+1/2

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