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