x+3x=2x-12

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



x+3x=2x-12

We move all terms to the left:

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

We add all the numbers together, and all the variables

4x-(2x-12)=0

We get rid of parentheses

4x-2x+12=0

We add all the numbers together, and all the variables

2x+12=0

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

2x=-12

x=-12/2

x=-6

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