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k in (-oo:+oo)
285/90 = k/20 // - k/20
285/90-(k/20) = 0
19/6-1/20*k = 0 // - 19/6
-1/20*k = -19/6 // : -1/20
k = -19/6/(-1/20)
k = 190/3
k = 190/3
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