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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)
(6*x^2+36*x+28)/(x+5) = 0
6*x^2+36*x+28 = 0
2*(3*x^2+18*x+14) = 0
3*x^2+18*x+14 = 0
DELTA = 18^2-(3*4*14)
DELTA = 156
DELTA > 0
x = (156^(1/2)-18)/(2*3) or x = (-156^(1/2)-18)/(2*3)
x = (2*39^(1/2)-18)/6 or x = (-2*39^(1/2)-18)/6
2*(x-((-2*39^(1/2)-18)/6))*(x-((2*39^(1/2)-18)/6)) = 0
(2*(x-((-2*39^(1/2)-18)/6))*(x-((2*39^(1/2)-18)/6)))/(x+5) = 0
( x-((-2*39^(1/2)-18)/6) )
x-((-2*39^(1/2)-18)/6) = 0 // + (-2*39^(1/2)-18)/6
x = (-2*39^(1/2)-18)/6
( x-((2*39^(1/2)-18)/6) )
x-((2*39^(1/2)-18)/6) = 0 // + (2*39^(1/2)-18)/6
x = (2*39^(1/2)-18)/6
x in { (-2*39^(1/2)-18)/6, (2*39^(1/2)-18)/6 }
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