12+9x=x-4

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Solution for 12+9x=x-4 equation: 



12+9x=x-4

We move all terms to the left:

12+9x-(x-4)=0

We get rid of parentheses

9x-x+4+12=0

We add all the numbers together, and all the variables

8x+16=0

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

8x=-16

x=-16/8

x=-2

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