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k in (-oo:+oo)
1/5-(7/6) = k/30 // - k/30
1/5-(k/30)-(7/6) = 0
1/5-(k/30)-7/6 = 0
-1/30*k-29/30 = 0 // + 29/30
-1/30*k = 29/30 // : -1/30
k = 29/30/(-1/30)
k = -29
k = -29
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