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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
50 = 1350*x^(-3/4) // - 1350*x^(-3/4)
50-(1350*x^(-3/4)) = 0
50-1350*x^(-3/4) = 0
-1350*x^(-3/4) = -50 // : -1350
x^(-3/4) = 1/27
-3/4 < 0
1/(x^(3/4)) = 1/27 // * x^(3/4)
1 = 1/27*x^(3/4) // : 1/27
27 = x^(3/4)
x^(3/4) = 27 // ^ 4
x^3 = 531441 // ^ 1/3
x = 81
x = 81
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