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D( x )
0.25-x = 0
0.25-x = 0
0.25-x = 0
0.25-x = 0 // - 0.25
-x = -0.25 // * -1
x = 0.25
x in (-oo:0.25) U (0.25:+oo)
7.07 = (2*x+0.5)/(0.25-x) // - (2*x+0.5)/(0.25-x)
7.07-((2*x+0.5)/(0.25-x)) = 0
(-1*(2*x+0.5))/(0.25-x)+7.07 = 0
(-1*(2*x+0.5))/(0.25-x)+(7.07*(0.25-x))/(0.25-x) = 0
7.07*(0.25-x)-1*(2*x+0.5) = 0
1.2675-9.07*x = 0
(1.2675-9.07*x)/(0.25-x) = 0
(1.2675-9.07*x)/(0.25-x) = 0 // * 0.25-x
1.2675-9.07*x = 0
1.2675-9.07*x = 0 // - 1.2675
-9.07*x = -1.2675 // : -9.07
x = -1.2675/(-9.07)
x = 0.13974642
x = 0.13974642
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