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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(-4*x)/(x-3) = (x-1)/2 // - (x-1)/2
(-4*x)/(x-3)-((x-1)/2) = 0
(-4*x)/(x-3)+(-1*(x-1))/2 = 0
(-4*2*x)/(2*(x-3))+(-1*(x-1)*(x-3))/(2*(x-3)) = 0
-1*(x-1)*(x-3)-4*2*x = 0
-x^2-4*x-3 = 0
-x^2-4*x-3 = 0
-1*(x^2+4*x+3) = 0
x^2+4*x+3 = 0
DELTA = 4^2-(1*3*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)-4)/(1*2) or x = (-4^(1/2)-4)/(1*2)
x = -1 or x = -3
-1*(x+3)*(x+1) = 0
(-1*(x+3)*(x+1))/(2*(x-3)) = 0
(-1*(x+3)*(x+1))/(2*(x-3)) = 0 // * 2*(x-3)
-1*(x+3)*(x+1) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x+3 )
x+3 = 0 // - 3
x = -3
x in { -1, -3 }
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