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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)
(2*x^2-(11*x)+5)/(2*x+3) = 0
(2*x^2-11*x+5)/(2*x+3) = 0
2*x^2-11*x+5 = 0
2*x^2-11*x+5 = 0
DELTA = (-11)^2-(2*4*5)
DELTA = 81
DELTA > 0
x = (81^(1/2)+11)/(2*2) or x = (11-81^(1/2))/(2*2)
x = 5 or x = 1/2
(x-1/2)*(x-5) = 0
((x-1/2)*(x-5))/(2*x+3) = 0
( x-1/2 )
x-1/2 = 0 // + 1/2
x = 1/2
( x-5 )
x-5 = 0 // + 5
x = 5
x in { 1/2, 5 }
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