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((3*(4^2-1))/2)*x^5-6+23 = 0
45/2*x^5 = -17 // : 45/2
x^5 = -34/45
x^5 = -34/45 // ^ 1/5
x = -(34/45)^(1/5)
x = -(34/45)^(1/5)
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