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k in (-oo:+oo)
(-7/3)*k-8/3 = -((4/5)*k)-8 // + -((4/5)*k)-8
(-7/3)*k+(4/5)*k-8/3+8 = 0
16/3-23/15*k = 0 // - 16/3
-23/15*k = -16/3 // : -23/15
k = -16/3/(-23/15)
k = 80/23
k = 80/23
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