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k in (-oo:+oo)
7*k-2/5 = 223/55 // - 223/55
7*k-2/5-(223/55) = 0
7*k-2/5-223/55 = 0
7*k-49/11 = 0 // + 49/11
7*k = 49/11 // : 7
k = 49/11/7
k = 7/11
k = 7/11
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