X-15=-y

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Solution for X-15=-y equation: 



X-15=-X

We move all terms to the left:

X-15-(-X)=0

We add all the numbers together, and all the variables

X-(-1X)-15=0

We get rid of parentheses

X+1X-15=0

We add all the numbers together, and all the variables

2X-15=0

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

2X=15

X=15/2

X=7+1/2

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