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D( x )
4*x+1 = 0
2*x = 0
4*x+1 = 0
4*x+1 = 0
4*x+1 = 0 // - 1
4*x = -1 // : 4
x = -1/4
2*x = 0
2*x = 0
2*x = 0 // : 2
x = 0
x in (-oo:-1/4) U (-1/4:0) U (0:+oo)
(5*x-3)/(2*x) = (10*x+3)/(4*x+1) // - (10*x+3)/(4*x+1)
(5*x-3)/(2*x)-((10*x+3)/(4*x+1)) = 0
(5*x-3)/(2*x)+(-1*(10*x+3))/(4*x+1) = 0
((5*x-3)*(4*x+1))/(2*x*(4*x+1))+(-1*2*x*(10*x+3))/(2*x*(4*x+1)) = 0
(5*x-3)*(4*x+1)-1*2*x*(10*x+3) = 0
-13*x-3 = 0
(-13*x-3)/(2*x*(4*x+1)) = 0
(-13*x-3)/(2*x*(4*x+1)) = 0 // * 2*x*(4*x+1)
-13*x-3 = 0
-13*x-3 = 0 // + 3
-13*x = 3 // : -13
x = 3/(-13)
x = -3/13
x = -3/13
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