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k in (-oo:+oo)
(-1/4)*k+5/3 = -((4/3)*k)-5 // + -((4/3)*k)-5
(-1/4)*k+(4/3)*k+5/3+5 = 0
13/12*k+20/3 = 0 // - 20/3
13/12*k = -20/3 // : 13/12
k = -20/3/13/12
k = -80/13
k = -80/13
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