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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
225 = 12/x // - 12/x
225-(12/x) = 0
225-12*x^-1 = 0
-12*x^-1 = -225 // : -12
x^-1 = 75/4
-1 < 0
1/(x^1) = 75/4 // * x^1
1 = 75/4*x^1 // : 75/4
4/75 = x^1
x = 4/75
x = 4/75
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