Solve for y
y\leq -7
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-3y\geq 15+6
Add 6 to both sides.
-3y\geq 21
Add 15 and 6 to get 21.
y\leq \frac{21}{-3}
Divide both sides by -3. Since -3 is negative, the inequality direction is changed.
y\leq -7
Divide 21 by -3 to get -7.
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