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D( x )
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0
2*x-3 = 0 // + 3
2*x = 3 // : 2
x = 3/2
x in (-oo:3/2) U (3/2:+oo)
(6*x^2-x-12)/(2*x-3) = 0
6*x^2-x-12 = 0
6*x^2-x-12 = 0
DELTA = (-1)^2-(-12*4*6)
DELTA = 289
DELTA > 0
x = (289^(1/2)+1)/(2*6) or x = (1-289^(1/2))/(2*6)
x = 3/2 or x = -4/3
(x+4/3)*(x-3/2) = 0
((x+4/3)*(x-3/2))/(2*x-3) = 0
( x+4/3 )
x+4/3 = 0 // - 4/3
x = -4/3
( x-3/2 )
x-3/2 = 0 // + 3/2
x = 3/2
x in { 3/2}
x = -4/3
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