X+y=15

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Solution for X+y=15 equation: 


Simplifying
X + y = 15

Solving
X + y = 15

Solving for variable 'X'.

Move all terms containing X to the left, all other terms to the right.

Add '-1y' to each side of the equation.
X + y + -1y = 15 + -1y

Combine like terms: y + -1y = 0
X + 0 = 15 + -1y
X = 15 + -1y

Simplifying
X = 15 + -1y

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