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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
18/x = 12/50 // - 12/50
18/x-(12/50) = 0
18/x-6/25 = 0
18*x^-1 = 6/25 // : 18
x^-1 = 1/75
-1 < 0
1/(x^1) = 1/75 // * x^1
1 = 1/75*x^1 // : 1/75
75 = x^1
x = 75
x = 75
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