Solve for x
x\leq -2
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9+x\leq \frac{-21}{-3}
Divide both sides by -3. Since -3 is negative, the inequality direction is changed.
9+x\leq 7
Divide -21 by -3 to get 7.
x\leq 7-9
Subtract 9 from both sides.
x\leq -2
Subtract 9 from 7 to get -2.
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