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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
30/250 = 50/x // - 50/x
30/250-(50/x) = 0
30/250-50*x^-1 = 0
-50*x^-1 = -3/25 // : -50
x^-1 = 3/1250
-1 < 0
1/(x^1) = 3/1250 // * x^1
1 = 3/1250*x^1 // : 3/1250
1250/3 = x^1
x = 1250/3
x = 1250/3
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