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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
12/x = 30/37 // - 30/37
12/x-(30/37) = 0
12/x-30/37 = 0
12*x^-1 = 30/37 // : 12
x^-1 = 5/74
-1 < 0
1/(x^1) = 5/74 // * x^1
1 = 5/74*x^1 // : 5/74
74/5 = x^1
x = 74/5
x = 74/5
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