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D( x )
2*x+1 = 0
3*x = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x in (-oo:-1/2) U (-1/2:0) U (0:+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*x+X+8*x-5 = 0
(2*X*x+X+8*x-5)/(3*x*(2*x+1)) = 0
(2*X*x+X+8*x-5)/(3*x*(2*x+1)) = 0 // * 3*x*(2*x+1)
2*X*x+X+8*x-5 = 0
X+8*x-5 = 0 // - X-5
8*x = -(X-5) // : 8
x = (-(X-5))/8
x = (5-X)/8
x = (5-X)/8
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