X+3x+12=x-15+x

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Solution for X+3x+12=x-15+x equation: 



X+3X+12=X-15+X

We move all terms to the left:

X+3X+12-(X-15+X)=0

We add all the numbers together, and all the variables

X+3X-(2X-15)+12=0

We add all the numbers together, and all the variables

4X-(2X-15)+12=0

We get rid of parentheses

4X-2X+15+12=0

We add all the numbers together, and all the variables

2X+27=0

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

2X=-27

X=-27/2

X=-13+1/2

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