21=X-9

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Solution for 21=X-9 equation:


Simplifying
21 = X + -9

Reorder the terms:
21 = -9 + X

Solving
21 = -9 + X

Solving for variable 'X'.

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

Add '-1X' to each side of the equation.
21 + -1X = -9 + X + -1X

Combine like terms: X + -1X = 0
21 + -1X = -9 + 0
21 + -1X = -9

Add '-21' to each side of the equation.
21 + -21 + -1X = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -1X = -9 + -21
-1X = -9 + -21

Combine like terms: -9 + -21 = -30
-1X = -30

Divide each side by '-1'.
X = 30

Simplifying
X = 30

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