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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)
(4*x^2-(10*x)-24)/(2*x+3) = 0
(4*x^2-10*x-24)/(2*x+3) = 0
4*x^2-10*x-24 = 0
2*(2*x^2-5*x-12) = 0
2*x^2-5*x-12 = 0
DELTA = (-5)^2-(-12*2*4)
DELTA = 121
DELTA > 0
x = (121^(1/2)+5)/(2*2) or x = (5-121^(1/2))/(2*2)
x = 4 or x = -3/2
2*(x+3/2)*(x-4) = 0
(2*(x+3/2)*(x-4))/(2*x+3) = 0
( x+3/2 )
x+3/2 = 0 // - 3/2
x = -3/2
( x-4 )
x-4 = 0 // + 4
x = 4
x in { -3/2}
x = 4
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