12+3x=x-4

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Solution for 12+3x=x-4 equation: 



12+3x=x-4

We move all terms to the left:

12+3x-(x-4)=0

We get rid of parentheses

3x-x+4+12=0

We add all the numbers together, and all the variables

2x+16=0

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

2x=-16

x=-16/2

x=-8

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