Solve for k
k\leq 2
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k-1\leq \frac{-36}{-36}
Divide both sides by -36. Since -36 is negative, the inequality direction is changed.
k-1\leq 1
Divide -36 by -36 to get 1.
k\leq 1+1
Add 1 to both sides.
k\leq 2
Add 1 and 1 to get 2.
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