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k in (-oo:+oo)
(3/2)*k+3/2 = -((4/5)*k)-4 // + -((4/5)*k)-4
(3/2)*k+(4/5)*k+3/2+4 = 0
23/10*k+11/2 = 0 // - 11/2
23/10*k = -11/2 // : 23/10
k = -11/2/23/10
k = -55/23
k = -55/23
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