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D( x )
x = 0
x-1 = 0
x = 0
x = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:0) U (0:1) U (1:+oo)
2/(x-1)+2/x = 0.9 // - 0.9
2/(x-1)+2/x-0.9 = 0
(2*x)/(x*(x-1))+(2*(x-1))/(x*(x-1))+(-0.9*x*(x-1))/(x*(x-1)) = 0
2*(x-1)-0.9*x*(x-1)+2*x = 0
4*x-0.9*x^2+0.9*x-2 = 0
4.9*x-0.9*x^2-2 = 0
4.9*x-0.9*x^2-2 = 0
4.9*x-0.9*x^2-2 = 0
DELTA = 4.9^2-(-2*(-0.9)*4)
DELTA = 4.9^2-7.2
DELTA = 16.81
DELTA > 0
x = ((4.9^2-7.2)^(1/2)-4.9)/(-0.9*2) or x = (-(4.9^2-7.2)^(1/2)-4.9)/(-0.9*2)
x = -0.55555556*((4.9^2-7.2)^(1/2)-4.9) or x = 0.55555556*((4.9^2-7.2)^(1/2)+4.9)
(x+0.55555556*((4.9^2-7.2)^(1/2)-4.9))*(x-0.55555556*((4.9^2-7.2)^(1/2)+4.9)) = 0
((x+0.55555556*((4.9^2-7.2)^(1/2)-4.9))*(x-0.55555556*((4.9^2-7.2)^(1/2)+4.9)))/(x*(x-1)) = 0
((x+0.55555556*((4.9^2-7.2)^(1/2)-4.9))*(x-0.55555556*((4.9^2-7.2)^(1/2)+4.9)))/(x*(x-1)) = 0 // * x*(x-1)
(x+0.55555556*((4.9^2-7.2)^(1/2)-4.9))*(x-0.55555556*((4.9^2-7.2)^(1/2)+4.9)) = 0
( x+0.55555556*((4.9^2-7.2)^(1/2)-4.9) )
x+0.55555556*((4.9^2-7.2)^(1/2)-4.9) = 0 // - 0.55555556*((4.9^2-7.2)^(1/2)-4.9)
x = -(0.55555556*((4.9^2-7.2)^(1/2)-4.9))
x = -0.55555556*((4.9^2-7.2)^(1/2)-4.9)
( x-0.55555556*((4.9^2-7.2)^(1/2)+4.9) )
x-0.55555556*((4.9^2-7.2)^(1/2)+4.9) = 0 // + -0.55555556*((4.9^2-7.2)^(1/2)+4.9)
x = -(-0.55555556*((4.9^2-7.2)^(1/2)+4.9))
x = 0.55555556*((4.9^2-7.2)^(1/2)+4.9)
x in { -0.55555556*((4.9^2-7.2)^(1/2)-4.9), 0.55555556*((4.9^2-7.2)^(1/2)+4.9) }
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