-(x+3)=2x+9

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Solution for -(x+3)=2x+9 equation: 



-(x+3)=2x+9

We move all terms to the left:

-(x+3)-(2x+9)=0

We get rid of parentheses

-x-2x-3-9=0

We add all the numbers together, and all the variables

-3x-12=0

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

-3x=12

x=12/-3

x=-4

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