Solve for x
x\leq -7
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-4x\geq 21+7
Add 7 to both sides.
-4x\geq 28
Add 21 and 7 to get 28.
x\leq \frac{28}{-4}
Divide both sides by -4. Since -4 is negative, the inequality direction is changed.
x\leq -7
Divide 28 by -4 to get -7.
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