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k in (-oo:+oo)
k/5 = 12/(-7) // - 12/(-7)
k/5-(12/(-7)) = 0
k/5+12/7 = 0
1/5*k+12/7 = 0 // - 12/7
1/5*k = -12/7 // : 1/5
k = -12/7/1/5
k = -60/7
k = -60/7
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