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k in (-oo:+oo)
(4/7)*k+5*k+5/7 = -3 // + 3
(4/7)*k+5*k+5/7+3 = 0
39/7*k+26/7 = 0 // - 26/7
39/7*k = -26/7 // : 39/7
k = -26/7/39/7
k = -2/3
k = -2/3
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