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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 = (0.8-(2*x))/(0.1-x) // - (0.8-(2*x))/(0.1-x)
5-((0.8-(2*x))/(0.1-x)) = 0
5-((0.8-2*x)/(0.1-x)) = 0
(-1*(0.8-2*x))/(0.1-x)+5 = 0
(-1*(0.8-2*x))/(0.1-x)+(5*(0.1-x))/(0.1-x) = 0
5*(0.1-x)-1*(0.8-2*x) = 0
-3*x-0.3 = 0
(-3*x-0.3)/(0.1-x) = 0
(-3*x-0.3)/(0.1-x) = 0 // * 0.1-x
-3*x-0.3 = 0
-3*x-0.3 = 0 // + 0.3
-3*x = 0.3 // : -3
x = 0.3/(-3)
x = -0.1
x = -0.1
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