-X-9=12

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Solution for -X-9=12 equation: 


Simplifying
-1X + -9 = 12

Reorder the terms:
-9 + -1X = 12

Solving
-9 + -1X = 12

Solving for variable 'X'.

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

Add '9' to each side of the equation.
-9 + 9 + -1X = 12 + 9

Combine like terms: -9 + 9 = 0
0 + -1X = 12 + 9
-1X = 12 + 9

Combine like terms: 12 + 9 = 21
-1X = 21

Divide each side by '-1'.
X = -21

Simplifying
X = -21

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