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k in (-oo:+oo)
k/(-5) = -4/7 // + -4/7
k/(-5)-(-4/7) = 0
k/(-5)+4/7 = 0
4/7-1/5*k = 0 // - 4/7
-1/5*k = -4/7 // : -1/5
k = -4/7/(-1/5)
k = 20/7
k = 20/7
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