Solve for a
a\leq -5630
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16070-a\geq 21700
Add 70 and 16000 to get 16070.
-a\geq 21700-16070
Subtract 16070 from both sides.
-a\geq 5630
Subtract 16070 from 21700 to get 5630.
a\leq -5630
Divide both sides by -1. Since -1 is negative, the inequality direction is changed.
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