(X)+21=9

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Solution for (X)+21=9 equation: 


Simplifying
(X) + 21 = 9
X + 21 = 9

Reorder the terms:
21 + X = 9

Solving
21 + X = 9

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 = 9 + -21

Combine like terms: 21 + -21 = 0
0 + X = 9 + -21
X = 9 + -21

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

Simplifying
X = -12

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