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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/5 = 45/x // - 45/x
3/5-(45/x) = 0
3/5-45*x^-1 = 0
-45*x^-1 = -3/5 // : -45
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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