Solve for k
k\geq 21
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\frac{-90}{-5}\leq k-3
Divide both sides by -5. Since -5 is negative, the inequality direction is changed.
18\leq k-3
Divide -90 by -5 to get 18.
k-3\geq 18
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
k\geq 18+3
Add 3 to both sides.
k\geq 21
Add 18 and 3 to get 21.
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