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k in (-oo:+oo)
k*((10*k^6)/2)-7 = 0
5*k^7 = 7 // : 5
k^7 = 7/5
k^7 = 7/5 // ^ 1/7
k = (7/5)^(1/7)
k = (7/5)^(1/7)
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