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k in (-oo:+oo)
(-3/4)*(k-20) < -7 // + 7
(-3/4)*(k-20)+7 < 0
7-3/4*(k-20) < 0
7-3/4*(k-20) < 0
22-3/4*k < 0
22-3/4*k < 0
22-3/4*k < 0 // - 22
-3/4*k < -22 // : -3/4
k > -22/(-3/4)
k > 88/3
(-oo:88/3) (88/3:+oo) 22-3/4*k + -
k in (88/3:+oo)
(88/3:+oo)
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