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k in (-oo:+oo)
k = (-61/(7^4))/21 // - (-61/(7^4))/21
k-((-61/(7^4))/21) = 0
k+(61/21)*7^-4 = 0
k+61/50421 = 0 // - 61/50421
k = -61/50421
k = -61/50421
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