X+3+9=12

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Solution for X+3+9=12 equation: 


Simplifying
X + 3 + 9 = 12

Reorder the terms:
3 + 9 + X = 12

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

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

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

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

Solving
X = 0

Solving for variable 'X'.

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

Simplifying
X = 0

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