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k in (-oo:+oo)
3/10-3*k = 4*k-(767/10) // - 4*k-(767/10)
3/10-3*k-(4*k)+767/10 = 0
3/10-3*k-4*k+767/10 = 0
77-7*k = 0 // - 77
-7*k = -77 // : -7
k = -77/(-7)
k = 11
k = 11
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