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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)
2/(5*x+1) = 1/(2*x-1) // - 1/(2*x-1)
2/(5*x+1)-(1/(2*x-1)) = 0
2/(5*x+1)-(2*x-1)^-1 = 0
2/(5*x+1)-1/(2*x-1) = 0
(2*(2*x-1))/((5*x+1)*(2*x-1))+(-1*(5*x+1))/((5*x+1)*(2*x-1)) = 0
2*(2*x-1)-1*(5*x+1) = 0
-x-3 = 0
(-x-3)/((5*x+1)*(2*x-1)) = 0
(-x-3)/((5*x+1)*(2*x-1)) = 0 // * (5*x+1)*(2*x-1)
-x-3 = 0
-x-3 = 0 // + 3
-x = 3 // * -1
x = -3
x = -3
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