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D( x )
x^2+x-30 = 0
x^2+x-30 = 0
x^2+x-30 = 0
x^2+x-30 = 0
DELTA = 1^2-(-30*1*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)-1)/(1*2) or x = (-121^(1/2)-1)/(1*2)
x = 5 or x = -6
x in (-oo:-6) U (-6:5) U (5:+oo)
(x^2-(12*x)+35)/(x^2+x-30) = 0
(x^2-12*x+35)/(x^2+x-30) = 0
x^2-12*x+35 = 0
x^2-12*x+35 = 0
DELTA = (-12)^2-(1*4*35)
DELTA = 4
DELTA > 0
x = (4^(1/2)+12)/(1*2) or x = (12-4^(1/2))/(1*2)
x = 7 or x = 5
(x-5)*(x-7) = 0
x^2+x-30 = 0
x^2+x-30 = 0
DELTA = 1^2-(-30*1*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)-1)/(1*2) or x = (-121^(1/2)-1)/(1*2)
x = 5 or x = -6
(x+6)*(x-5) = 0
((x-5)*(x-7))/((x+6)*(x-5)) = 0
( x-5 )
x-5 = 0 // + 5
x = 5
( x-7 )
x-7 = 0 // + 7
x = 7
x in { 5}
x = 7
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