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