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D( x )
3*x+4 = 0
3*x+4 = 0
3*x+4 = 0
3*x+4 = 0 // - 4
3*x = -4 // : 3
x = -4/3
x in (-oo:-4/3) U (-4/3:+oo)
(6*x^2+17*x+7)/(3*x+4) = 0
6*x^2+17*x+7 = 0
6*x^2+17*x+7 = 0
DELTA = 17^2-(4*6*7)
DELTA = 121
DELTA > 0
x = (121^(1/2)-17)/(2*6) or x = (-121^(1/2)-17)/(2*6)
x = -1/2 or x = -7/3
(x+7/3)*(x+1/2) = 0
((x+7/3)*(x+1/2))/(3*x+4) = 0
( x+1/2 )
x+1/2 = 0 // - 1/2
x = -1/2
( x+7/3 )
x+7/3 = 0 // - 7/3
x = -7/3
x in { -1/2, -7/3 }
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