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D( x )
x < 0
x < 0
x in <0:+oo)
7.08 = (2*x^3.14)/2 // - (2*x^3.14)/2
7.08-((2*x^3.14)/2) = 0
7.08-x^3.14 = 0
-1*x^3.14 = -7.08 // : -1
x^3.14 = 7.08
x^3 = 7.08^(1/0.14) // ^ 1/3
x = 7.08^2.3809523561904762
x = 7.08^2.3809523561904762
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