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k in (-oo:+oo)
58/35 = 3*k-4*k+6/7 // - 3*k-4*k+6/7
58/35-(-4*k)-(3*k)-(6/7) = 0
4*k-3*k+58/35-6/7 = 0
k+4/5 = 0 // - 4/5
k = -4/5
k = -4/5
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