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k in (-oo:+oo)
(-3/5)*k+5/6 = -((5/3)*k)-2 // + -((5/3)*k)-2
(-3/5)*k+(5/3)*k+5/6+2 = 0
16/15*k+17/6 = 0 // - 17/6
16/15*k = -17/6 // : 16/15
k = -17/6/16/15
k = -85/32
k = -85/32
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