Solve for a
a<7
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-3a>-3-18
Subtract 18 from both sides.
-3a>-21
Subtract 18 from -3 to get -21.
a<\frac{-21}{-3}
Divide both sides by -3. Since -3 is negative, the inequality direction is changed.
a<7
Divide -21 by -3 to get 7.
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