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D( x )
x+5 = 0
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:+oo)
(2*x^2+14*x+24)/(x+5) = 0
2*x^2+14*x+24 = 0
2*(x^2+7*x+12) = 0
x^2+7*x+12 = 0
DELTA = 7^2-(1*4*12)
DELTA = 1
DELTA > 0
x = (1^(1/2)-7)/(1*2) or x = (-1^(1/2)-7)/(1*2)
x = -3 or x = -4
2*(x+4)*(x+3) = 0
(2*(x+4)*(x+3))/(x+5) = 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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