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k in (-oo:+oo)
k+(5/2)/7 = (2/27)/70 // - (2/27)/70
k+(5/2)/7-((2/27)/70) = 0
k+(5/2)/7-1/945 = 0
k+673/1890 = 0 // - 673/1890
k = -673/1890
k = -673/1890
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