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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
350/60 = 225/x // - 225/x
350/60-(225/x) = 0
350/60-225*x^-1 = 0
-225*x^-1 = -35/6 // : -225
x^-1 = 7/270
-1 < 0
1/(x^1) = 7/270 // * x^1
1 = 7/270*x^1 // : 7/270
270/7 = x^1
x = 270/7
x = 270/7
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