Solve for k
k\leq 2
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18\geq 9k
Combine 5k and 4k to get 9k.
9k\leq 18
Swap sides so that all variable terms are on the left hand side. This changes the sign direction.
k\leq \frac{18}{9}
Divide both sides by 9. Since 9 is positive, the inequality direction remains the same.
k\leq 2
Divide 18 by 9 to get 2.
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