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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
24/100 = 420/x // - 420/x
24/100-(420/x) = 0
24/100-420*x^-1 = 0
-420*x^-1 = -6/25 // : -420
x^-1 = 1/1750
-1 < 0
1/(x^1) = 1/1750 // * x^1
1 = 1/1750*x^1 // : 1/1750
1750 = x^1
x = 1750
x = 1750
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