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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25/125 = 18/x // - 18/x
25/125-(18/x) = 0
25/125-18*x^-1 = 0
-18*x^-1 = -1/5 // : -18
x^-1 = 1/90
-1 < 0
1/(x^1) = 1/90 // * x^1
1 = 1/90*x^1 // : 1/90
90 = x^1
x = 90
x = 90
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