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2*7*8*10*75*90*x^60 = 5/7 // - 5/7
2*7*8*10*75*90*x^60-(5/7) = 0
2*7*8*10*75*90*x^60-5/7 = 0
7560000*x^60 = 5/7 // : 7560000
x^60 = 1/10584000
x^60 = 1/10584000 // ^ 1/60
abs(x) = (1/10584000)^(1/60)
x = (1/10584000)^(1/60) or x = -(1/10584000)^(1/60)
x in { (1/10584000)^(1/60), -(1/10584000)^(1/60) }
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