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D( x )
3*x = 0
2*x-1 = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:0) U (0:1/2) U (1/2:+oo)
(x-5)/(3*x)+6/(2*x-1) = 0
((x-5)*(2*x-1))/(3*x*(2*x-1))+(3*6*x)/(3*x*(2*x-1)) = 0
(x-5)*(2*x-1)+3*6*x = 0
2*x^2+7*x+5 = 0
2*x^2+7*x+5 = 0
2*x^2+7*x+5 = 0
DELTA = 7^2-(2*4*5)
DELTA = 9
DELTA > 0
x = (9^(1/2)-7)/(2*2) or x = (-9^(1/2)-7)/(2*2)
x = -1 or x = -5/2
(x+5/2)*(x+1) = 0
((x+5/2)*(x+1))/(3*x*(2*x-1)) = 0
((x+5/2)*(x+1))/(3*x*(2*x-1)) = 0 // * 3*x*(2*x-1)
(x+5/2)*(x+1) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x+5/2 )
x+5/2 = 0 // - 5/2
x = -5/2
x in { -1, -5/2 }
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