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D( x )
0.11-x = 0
0.11-x = 0
0.11-x = 0
0.11-x = 0 // - 0.11
-x = -0.11 // * -1
x = 0.11
x in (-oo:0.11) U (0.11:+oo)
7.07 = (2*x+0.78)/(0.11-x) // - (2*x+0.78)/(0.11-x)
7.07-((2*x+0.78)/(0.11-x)) = 0
(-1*(2*x+0.78))/(0.11-x)+7.07 = 0
(-1*(2*x+0.78))/(0.11-x)+(7.07*(0.11-x))/(0.11-x) = 0
7.07*(0.11-x)-1*(2*x+0.78) = 0
-9.07*x-0.0023 = 0
(-9.07*x-0.0023)/(0.11-x) = 0
(-9.07*x-0.0023)/(0.11-x) = 0 // * 0.11-x
-9.07*x-0.0023 = 0
-9.07*x-0.0023 = 0 // + 0.0023
-9.07*x = 0.0023 // : -9.07
x = 0.0023/(-9.07)
x = -0.00025358
x = -0.00025358
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