Solve for a
a\leq -\frac{5}{2}
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-2a\geq 15-10
Subtract 10 from both sides.
-2a\geq 5
Subtract 10 from 15 to get 5.
a\leq -\frac{5}{2}
Divide both sides by -2. Since -2 is negative, the inequality direction is changed.
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