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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/11 = 49.5/x // - 49.5/x
18/11-(49.5/x) = 0
18/11-49.5*x^-1 = 0
-49.5*x^-1 = -18/11 // : -49.5
x^-1 = 0.03305785
-1 < 0
1/(x^1) = 0.03305785 // * x^1
1 = 0.03305785*x^1 // : 0.03305785
30.25000113 = x^1
x = 30.25000113
x = 30.25000113
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