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D( x )
3*x+3 = 0
x^2+2*x-3 = 0
3*x+3 = 0
3*x+3 = 0
3*x+3 = 0 // - 3
3*x = -3 // : 3
x = -3/3
x = -1
x^2+2*x-3 = 0
x^2+2*x-3 = 0
x^2+2*x-3 = 0
DELTA = 2^2-(-3*1*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)-2)/(1*2) or x = (-16^(1/2)-2)/(1*2)
x = 1 or x = -3
x in (-oo:-3) U (-3:-1) U (-1:1) U (1:+oo)
(((X^2+x-6)/(3*x+3))*(x+1))/(x^2+2*x-3) = 0
((X^2+x-6)*(x+1))/((3*x+3)*(x^2+2*x-3)) = 0
x^2+2*x-3 = 0
x^2+2*x-3 = 0
DELTA = 2^2-(-3*1*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)-2)/(1*2) or x = (-16^(1/2)-2)/(1*2)
x = 1 or x = -3
(x+3)*(x-1) = 0
((X^2+x-6)*(x+1))/((3*x+3)*(x+3)*(x-1)) = 0
( X^2+x-6 )
X^2+x-6 = 0 // - X^2-6
x = -(X^2-6)
x = 6-X^2
( x+1 )
x+1 = 0 // - 1
x = -1
x in { -1}
x = 6-X^2
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