X+12-6=21

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Solution for X+12-6=21 equation: 


Simplifying
X + 12 + -6 = 21

Reorder the terms:
12 + -6 + X = 21

Combine like terms: 12 + -6 = 6
6 + X = 21

Solving
6 + X = 21

Solving for variable 'X'.

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

Add '-6' to each side of the equation.
6 + -6 + X = 21 + -6

Combine like terms: 6 + -6 = 0
0 + X = 21 + -6
X = 21 + -6

Combine like terms: 21 + -6 = 15
X = 15

Simplifying
X = 15

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