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k in (-oo:+oo)
20 = (16*k)/3 // - (16*k)/3
20-((16*k)/3) = 0
(-16/3)*k+20 = 0
20-16/3*k = 0 // - 20
-16/3*k = -20 // : -16/3
k = -20/(-16/3)
k = 15/4
k = 15/4
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