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D( x )
2*x+1 = 0
x+5 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x+5 = 0
x+5 = 0
x+5 = 0 // - 5
x = -5
x in (-oo:-5) U (-5:-1/2) U (-1/2:+oo)
(4*x-5)/(2*x+1) = (2*x-1)/(x+5) // - (2*x-1)/(x+5)
(4*x-5)/(2*x+1)-((2*x-1)/(x+5)) = 0
(4*x-5)/(2*x+1)+(-1*(2*x-1))/(x+5) = 0
((4*x-5)*(x+5))/((2*x+1)*(x+5))+(-1*(2*x-1)*(2*x+1))/((2*x+1)*(x+5)) = 0
(4*x-5)*(x+5)-1*(2*x-1)*(2*x+1) = 0
15*x-24 = 0
(15*x-24)/((2*x+1)*(x+5)) = 0
(15*x-24)/((2*x+1)*(x+5)) = 0 // * (2*x+1)*(x+5)
15*x-24 = 0
15*x-24 = 0 // + 24
15*x = 24 // : 15
x = 24/15
x = 8/5
x = 8/5
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