-2x-(x+3)=12

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Solution for -2x-(x+3)=12 equation: 



-2x-(x+3)=12

We move all terms to the left:

-2x-(x+3)-(12)=0

We get rid of parentheses

-2x-x-3-12=0

We add all the numbers together, and all the variables

-3x-15=0

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

-3x=15

x=15/-3

x=-5

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