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D( x )
0.02-x = 0
0.02-x = 0
0.02-x = 0
0.02-x = 0 // - 0.02
-x = -0.02 // * -1
x = 0.02
x in (-oo:0.02) U (0.02:+oo)
x/(0.02-x) = 0.76 // - 0.76
x/(0.02-x)-0.76 = 0
x/(0.02-x)+(-0.76*(0.02-x))/(0.02-x) = 0
x-0.76*(0.02-x) = 0
1.76*x-0.0152 = 0
(1.76*x-0.0152)/(0.02-x) = 0
(1.76*x-0.0152)/(0.02-x) = 0 // * 0.02-x
1.76*x-0.0152 = 0
1.76*x-0.0152 = 0 // + 0.0152
1.76*x = 0.0152 // : 1.76
x = 0.0152/1.76
x = 0.00863636
x = 0.00863636
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