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D( x )
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0
2*x+1 = 0 // - 1
2*x = -1 // : 2
x = -1/2
x in (-oo:-1/2) U (-1/2:+oo)
(3*x-2)/(2*x+1) = 3/5 // - 3/5
(3*x-2)/(2*x+1)-(3/5) = 0
(3*x-2)/(2*x+1)-3/5 = 0
(5*(3*x-2))/(5*(2*x+1))+(-3*(2*x+1))/(5*(2*x+1)) = 0
5*(3*x-2)-3*(2*x+1) = 0
9*x-13 = 0
(9*x-13)/(5*(2*x+1)) = 0
(9*x-13)/(5*(2*x+1)) = 0 // * 5*(2*x+1)
9*x-13 = 0
9*x-13 = 0 // + 13
9*x = 13 // : 9
x = 13/9
x = 13/9
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