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D( x )
0.034-x = 0
0.034-x = 0
0.034-x = 0
0.034-x = 0 // - 0.034
-x = -0.034 // * -1
x = 0.034
x in (-oo:0.034) U (0.034:+oo)
x/(0.034-x) = 2.5 // - 2.5
x/(0.034-x)-2.5 = 0
x/(0.034-x)+(-2.5*(0.034-x))/(0.034-x) = 0
x-2.5*(0.034-x) = 0
3.5*x-0.085 = 0
(3.5*x-0.085)/(0.034-x) = 0
(3.5*x-0.085)/(0.034-x) = 0 // * 0.034-x
3.5*x-0.085 = 0
3.5*x-0.085 = 0 // + 0.085
3.5*x = 0.085 // : 3.5
x = 0.085/3.5
x = 0.02428571
x = 0.02428571
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