X+12=-6x-9

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Solution for X+12=-6x-9 equation: 



X+12=-6X-9

We move all terms to the left:

X+12-(-6X-9)=0

We get rid of parentheses

X+6X+9+12=0

We add all the numbers together, and all the variables

7X+21=0

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

7X=-21

X=-21/7

X=-3

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