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((((10/21)/3)/7)*x^9)/4+3/4 = 0
5/882*x^9 = -3/4 // : 5/882
x^9 = -1323/10
x^9 = -1323/10 // ^ 1/9
x = -(1323/10)^(1/9)
x = -(1323/10)^(1/9)
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