X+9+12=13

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Solution for X+9+12=13 equation: 


Simplifying
X + 9 + 12 = 13

Reorder the terms:
9 + 12 + X = 13

Combine like terms: 9 + 12 = 21
21 + X = 13

Solving
21 + X = 13

Solving for variable 'X'.

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

Add '-21' to each side of the equation.
21 + -21 + X = 13 + -21

Combine like terms: 21 + -21 = 0
0 + X = 13 + -21
X = 13 + -21

Combine like terms: 13 + -21 = -8
X = -8

Simplifying
X = -8

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