Solve for a
a\leq 3
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30a+180-18a\leq 216
Use the distributive property to multiply 18 by 10-a.
12a+180\leq 216
Combine 30a and -18a to get 12a.
12a\leq 216-180
Subtract 180 from both sides.
12a\leq 36
Subtract 180 from 216 to get 36.
a\leq \frac{36}{12}
Divide both sides by 12. Since 12 is positive, the inequality direction remains the same.
a\leq 3
Divide 36 by 12 to get 3.
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