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D( x )
x^2+6*x+9 = 0
x+3 = 0
x^2+6*x+9 = 0
x^2+6*x+9 = 0
x^2+6*x+9 = 0
DELTA = 6^2-(1*4*9)
DELTA = 0
x = -6/(1*2)
x = -3 or x = -3
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
x/(x+3)+(2*x+6)/(x^2+6*x+9) = 0
x^2+6*x+9 = 0
x^2+6*x+9 = 0
x^2+6*x+9 = 0
DELTA = 6^2-(1*4*9)
DELTA = 0
x = -6/(1*2)
x = -3 or x = -3
(x+3)^2 = 0
x/(x+3)+(2*x+6)/((x+3)^2) = 0
(x*(x+3))/((x+3)^2)+(2*x+6)/((x+3)^2) = 0
x*(x+3)+2*x+6 = 0
x^2+5*x+6 = 0
x^2+5*x+6 = 0
x^2+5*x+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)-5)/(1*2) or x = (-1^(1/2)-5)/(1*2)
x = -2 or x = -3
(x+3)*(x+2) = 0
((x+3)*(x+2))/((x+3)^2) = 0
((x+3)*(x+2))/((x+3)^2) = 0 // * (x+3)^2
(x+3)*(x+2) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x+3 )
x+3 = 0 // - 3
x = -3
x in { -3}
x = -2
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