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D( x )
0.1497-x = 0
0.1497-x = 0
0.1497-x = 0
0.1497-x = 0 // - 0.1497
-x = -0.1497 // * -1
x = 0.1497
x in (-oo:0.1497) U (0.1497:+oo)
0.167 = x/(0.1497-x) // - x/(0.1497-x)
0.167-(x/(0.1497-x)) = 0
(-1*x)/(0.1497-x)+0.167 = 0
(-1*x)/(0.1497-x)+(0.167*(0.1497-x))/(0.1497-x) = 0
0.167*(0.1497-x)-1*x = 0
0.0249999-1.167*x = 0
(0.0249999-1.167*x)/(0.1497-x) = 0
(0.0249999-1.167*x)/(0.1497-x) = 0 // * 0.1497-x
0.0249999-1.167*x = 0
0.0249999-1.167*x = 0 // - 0.0249999
-1.167*x = -0.0249999 // : -1.167
x = -0.0249999/(-1.167)
x = 0.02142237
x = 0.02142237
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