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k in (-oo:+oo)
(3/5)*k+15 = -4 // + 4
(3/5)*k+4+15 = 0
3/5*k+19 = 0 // - 19
3/5*k = -19 // : 3/5
k = -19/3/5
k = -95/3
k = -95/3
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