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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
101.25/15 = 459/x // - 459/x
101.25/15-(459/x) = 0
101.25/15-459*x^-1 = 0
-459*x^-1 = -6.75 // : -459
x^-1 = 0.01470588
-1 < 0
1/(x^1) = 0.01470588 // * x^1
1 = 0.01470588*x^1 // : 0.01470588
68.00001088 = x^1
x = 68.00001088
x = 68.00001088
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