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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)
x/(x+1) = 0.06818 // - 0.06818
x/(x+1)-0.06818 = 0
x/(x+1)+(-0.06818*(x+1))/(x+1) = 0
x-0.06818*(x+1) = 0
0.93182*x-0.06818 = 0
(0.93182*x-0.06818)/(x+1) = 0
(0.93182*x-0.06818)/(x+1) = 0 // * x+1
0.93182*x-0.06818 = 0
0.93182*x-0.06818 = 0 // + 0.06818
0.93182*x = 0.06818 // : 0.93182
x = 0.06818/0.93182
x = 0.07316864
x = 0.07316864
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