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D( x )
x+0.1 = 0
x+0.1 = 0
x+0.1 = 0
x+0.1 = 0 // - 0.1
x = -0.1
x in (-oo:-0.1) U (-0.1:+oo)
4 = (0.7-(2*x))/(x+0.1) // - (0.7-(2*x))/(x+0.1)
4-((0.7-(2*x))/(x+0.1)) = 0
4-((0.7-2*x)/(x+0.1)) = 0
(-1*(0.7-2*x))/(x+0.1)+4 = 0
(-1*(0.7-2*x))/(x+0.1)+(4*(x+0.1))/(x+0.1) = 0
4*(x+0.1)-1*(0.7-2*x) = 0
6*x-0.3 = 0
(6*x-0.3)/(x+0.1) = 0
(6*x-0.3)/(x+0.1) = 0 // * x+0.1
6*x-0.3 = 0
6*x-0.3 = 0 // + 0.3
6*x = 0.3 // : 6
x = 0.3/6
x = 0.05
x = 0.05
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