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9-x>-12
Multiply both sides of the equation by 3. Since 3 is positive, the inequality direction remains the same.
-x>-12-9
Subtract 9 from both sides.
-x>-21
Subtract 9 from -12 to get -21.
x<\frac{-21}{-1}
Divide both sides by -1. Since -1 is negative, the inequality direction is changed.
x<21
Fraction \frac{-21}{-1} can be simplified to 21 by removing the negative sign from both the numerator and the denominator.