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D( x )
0.1-x = 0
0.1-x = 0
0.1-x = 0
0.1-x = 0 // - 0.1
-x = -0.1 // * -1
x = 0.1
x in (-oo:0.1) U (0.1:+oo)
5 = (0.5-x)/(0.1-x) // - (0.5-x)/(0.1-x)
5-((0.5-x)/(0.1-x)) = 0
(-1*(0.5-x))/(0.1-x)+5 = 0
(-1*(0.5-x))/(0.1-x)+(5*(0.1-x))/(0.1-x) = 0
5*(0.1-x)-1*(0.5-x) = 0
-4*x = 0
(-4*x)/(0.1-x) = 0
(-4*x)/(0.1-x) = 0 // * 0.1-x
-4*x = 0
-4*x = 0 // : -4
x = 0
x = 0
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