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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
x-(6/(x+2))-3 = 0
x-6*(x+2)^-1-3 = 0
x-6/(x+2)-3 = 0
(x*(x+2))/(x+2)-6/(x+2)+(-3*(x+2))/(x+2) = 0
x*(x+2)-3*(x+2)-6 = 0
x^2+2*x-3*x-6-6 = 0
x^2-x-12 = 0
x^2-x-12 = 0
x^2-x-12 = 0
DELTA = (-1)^2-(-12*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+1)/(1*2) or x = (1-49^(1/2))/(1*2)
x = 4 or x = -3
(x+3)*(x-4) = 0
((x+3)*(x-4))/(x+2) = 0
((x+3)*(x-4))/(x+2) = 0 // * x+2
(x+3)*(x-4) = 0
( x+3 )
x+3 = 0 // - 3
x = -3
( x-4 )
x-4 = 0 // + 4
x = 4
x in { -3, 4 }
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