18+X=15

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Solution for 18+X=15 equation: 


Simplifying
18 + X = 15

Solving
18 + X = 15

Solving for variable 'X'.

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

Add '-18' to each side of the equation.
18 + -18 + X = 15 + -18

Combine like terms: 18 + -18 = 0
0 + X = 15 + -18
X = 15 + -18

Combine like terms: 15 + -18 = -3
X = -3

Simplifying
X = -3

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