X-15=12-x

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Solution for X-15=12-x equation: 



X-15=12-X

We move all terms to the left:

X-15-(12-X)=0

We add all the numbers together, and all the variables

X-(-1X+12)-15=0

We get rid of parentheses

X+1X-12-15=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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