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k in (-oo:+oo)
3-7*k = 4*k-63 // - 4*k-63
3-7*k-(4*k)+63 = 0
3-7*k-4*k+63 = 0
66-11*k = 0 // - 66
-11*k = -66 // : -11
k = -66/(-11)
k = 6
k = 6
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