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k in (-oo:+oo)
20 = (25*k)/2 // - (25*k)/2
20-((25*k)/2) = 0
(-25/2)*k+20 = 0
20-25/2*k = 0 // - 20
-25/2*k = -20 // : -25/2
k = -20/(-25/2)
k = 8/5
k = 8/5
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