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D( x )
5*x+1 = 0
2*x-1 = 0
5*x+1 = 0
5*x+1 = 0
5*x+1 = 0 // - 1
5*x = -1 // : 5
x = -1/5
2*x-1 = 0
2*x-1 = 0
2*x-1 = 0 // + 1
2*x = 1 // : 2
x = 1/2
x in (-oo:-1/5) U (-1/5:1/2) U (1/2:+oo)
6/(5*x+1) = 2/(2*x-1) // - 2/(2*x-1)
6/(5*x+1)-(2/(2*x-1)) = 0
6/(5*x+1)-2*(2*x-1)^-1 = 0
6/(5*x+1)-2/(2*x-1) = 0
(6*(2*x-1))/((5*x+1)*(2*x-1))+(-2*(5*x+1))/((5*x+1)*(2*x-1)) = 0
6*(2*x-1)-2*(5*x+1) = 0
2*x-8 = 0
(2*x-8)/((5*x+1)*(2*x-1)) = 0
(2*x-8)/((5*x+1)*(2*x-1)) = 0 // * (5*x+1)*(2*x-1)
2*x-8 = 0
2*x-8 = 0 // + 8
2*x = 8 // : 2
x = 8/2
x = 4
x = 4
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