X+3+9=15

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Solution for X+3+9=15 equation: 


Simplifying
X + 3 + 9 = 15

Reorder the terms:
3 + 9 + X = 15

Combine like terms: 3 + 9 = 12
12 + X = 15

Solving
12 + X = 15

Solving for variable 'X'.

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

Add '-12' to each side of the equation.
12 + -12 + X = 15 + -12

Combine like terms: 12 + -12 = 0
0 + X = 15 + -12
X = 15 + -12

Combine like terms: 15 + -12 = 3
X = 3

Simplifying
X = 3

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