3(-1x-1)=-21

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Solution for 3(-1x-1)=-21 equation: 



3(-1x-1)=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We multiply parentheses

-3x-3+21=0

We add all the numbers together, and all the variables

-3x+18=0

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

-3x=-18

x=-18/-3

x=+6

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