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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
21.5/25.3 = 146.2/x // - 146.2/x
21.5/25.3-(146.2/x) = 0
21.5/25.3-146.2*x^-1 = 0
-146.2*x^-1 = -0.84980237 // : -146.2
x^-1 = 0.0058126
-1 < 0
1/(x^1) = 0.0058126 // * x^1
1 = 0.0058126*x^1 // : 0.0058126
172.04005092 = x^1
x = 172.04005092
x = 172.04005092
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