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D( x )
x+1 = 0
x+1 = 0
x+1 = 0
x+1 = 0 // - 1
x = -1
x in (-oo:-1) U (-1:+oo)
0.5 = (2*x+1)/(x+1) // - (2*x+1)/(x+1)
0.5-((2*x+1)/(x+1)) = 0
(-1*(2*x+1))/(x+1)+0.5 = 0
(-1*(2*x+1))/(x+1)+(0.5*(x+1))/(x+1) = 0
0.5*(x+1)-1*(2*x+1) = 0
-1.5*x-0.5 = 0
(-1.5*x-0.5)/(x+1) = 0
(-1.5*x-0.5)/(x+1) = 0 // * x+1
-1.5*x-0.5 = 0
-1.5*x-0.5 = 0 // + 0.5
-1.5*x = 0.5 // : -1.5
x = 0.5/(-1.5)
x = -0.33333333
x = -0.33333333
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