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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
56/x = 5.4/7.2 // - 5.4/7.2
56/x-(5.4/7.2) = 0
56/x-0.75 = 0
56*x^-1 = 0.75 // : 56
x^-1 = 0.01339286
-1 < 0
1/(x^1) = 0.01339286 // * x^1
1 = 0.01339286*x^1 // : 0.01339286
74.66665074 = x^1
x = 74.66665074
x = 74.66665074
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