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k in (-oo:+oo)
k/4 = -4/7 // + -4/7
k/4-(-4/7) = 0
k/4+4/7 = 0
1/4*k+4/7 = 0 // - 4/7
1/4*k = -4/7 // : 1/4
k = -4/7/1/4
k = -16/7
k = -16/7
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