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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
429/x = 21/100 // - 21/100
429/x-(21/100) = 0
429/x-21/100 = 0
429*x^-1 = 21/100 // : 429
x^-1 = 7/14300
-1 < 0
1/(x^1) = 7/14300 // * x^1
1 = 7/14300*x^1 // : 7/14300
14300/7 = x^1
x = 14300/7
x = 14300/7
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