Solve for a
a\leq 15
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a-4\leq \frac{33}{3}
Divide both sides by 3. Since 3 is positive, the inequality direction remains the same.
a-4\leq 11
Divide 33 by 3 to get 11.
a\leq 11+4
Add 4 to both sides.
a\leq 15
Add 11 and 4 to get 15.
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