-1x-9=12+2x

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Solution for -1x-9=12+2x equation: 



-1x-9=12+2x

We move all terms to the left:

-1x-9-(12+2x)=0

We add all the numbers together, and all the variables

-1x-(2x+12)-9=0

We get rid of parentheses

-1x-2x-12-9=0

We add all the numbers together, and all the variables

-3x-21=0

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

-3x=21

x=21/-3

x=-7

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