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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
20 = (60/100)*(63/x) // - (60/100)*(63/x)
20-((60/100)*(63/x)) = 0
(-189/5)*x^-1+20 = 0
-189/5*x^-1 = -20 // : -189/5
x^-1 = 100/189
-1 < 0
1/(x^1) = 100/189 // * x^1
1 = 100/189*x^1 // : 100/189
189/100 = x^1
x = 189/100
x = 189/100
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