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D( x )
x < 0
x < 0
x in <0:+oo)
N/8.2 = -0.6*x^8.2 // + -0.6*x^8.2
N/8.2-(-0.6*x^8.2) = 0
N/8.2+0.6*x^8.2 = 0
0.6*x^8.2 = -(0.12195122*N) // : 0.6
x^8.2 = -0.20325203*N
x^8 = (-0.20325203*N)^(1/0.2) // ^ 1/8
abs(x) = (-0.20325203^5)^(1/8)*N^(5/8)
x = (-0.20325203^5)^(1/8)*N^(5/8) or x = -((-0.20325203^5)^(1/8)*N^(5/8))
x in { (-0.20325203^5)^(1/8)*N^(5/8), -((-0.20325203^5)^(1/8)*N^(5/8)) }
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