Solve for b
b\geq -3
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\frac{21}{-7}\leq b
Divide both sides by -7. Since -7 is negative, the inequality direction is changed.
-3\leq b
Divide 21 by -7 to get -3.
b\geq -3
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
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