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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/22 = 30/x // - 30/x
12/22-(30/x) = 0
12/22-30*x^-1 = 0
-30*x^-1 = -6/11 // : -30
x^-1 = 1/55
-1 < 0
1/(x^1) = 1/55 // * x^1
1 = 1/55*x^1 // : 1/55
55 = x^1
x = 55
x = 55
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