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D( x )
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x in (-oo:2/3) U (2/3:+oo)
(6*x^2-x-7)/(3*x-2) = 0
6*x^2-x-7 = 0
6*x^2-x-7 = 0
DELTA = (-1)^2-(-7*4*6)
DELTA = 169
DELTA > 0
x = (169^(1/2)+1)/(2*6) or x = (1-169^(1/2))/(2*6)
x = 7/6 or x = -1
(x+1)*(x-7/6) = 0
((x+1)*(x-7/6))/(3*x-2) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-7/6 )
x-7/6 = 0 // + 7/6
x = 7/6
x in { -1, 7/6 }
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