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k in (-oo:+oo)
(2/3)*k+4/3 = -((2/5)*k)-5 // + -((2/5)*k)-5
(2/3)*k+(2/5)*k+4/3+5 = 0
16/15*k+19/3 = 0 // - 19/3
16/15*k = -19/3 // : 16/15
k = -19/3/16/15
k = -95/16
k = -95/16
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