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D( x )
2*x+2 = 0
x-1 = 0
2*x+2 = 0
2*x+2 = 0
2*x+2 = 0 // - 2
2*x = -2 // : 2
x = -2/2
x = -1
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:-1) U (-1:1) U (1:+oo)
(x-2)/(x-1) = (x+4)/(2*x+2) // - (x+4)/(2*x+2)
(x-2)/(x-1)-((x+4)/(2*x+2)) = 0
(x-2)/(x-1)+(-1*(x+4))/(2*x+2) = 0
((x-2)*(2*x+2))/((x-1)*(2*x+2))+(-1*(x+4)*(x-1))/((x-1)*(2*x+2)) = 0
(x-2)*(2*x+2)-1*(x+4)*(x-1) = 0
x^2-5*x = 0
x^2-5*x = 0
x*(x-5) = 0
x-5 = 0 // + 5
x = 5
x*(x-5) = 0
(x*(x-5))/((x-1)*(2*x+2)) = 0
(x*(x-5))/((x-1)*(2*x+2)) = 0 // * (x-1)*(2*x+2)
x*(x-5) = 0
( x-5 )
x-5 = 0 // + 5
x = 5
( x )
x = 0
x in { 5, 0 }
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