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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)
3/5 = 6/(2*x-1) // - 6/(2*x-1)
3/5-(6/(2*x-1)) = 0
3/5-6*(2*x-1)^-1 = 0
3/5-6/(2*x-1) = 0
(-6*5)/(5*(2*x-1))+(3*(2*x-1))/(5*(2*x-1)) = 0
3*(2*x-1)-6*5 = 0
6*x-33 = 0
(6*x-33)/(5*(2*x-1)) = 0
(6*x-33)/(5*(2*x-1)) = 0 // * 5*(2*x-1)
6*x-33 = 0
6*x-33 = 0 // + 33
6*x = 33 // : 6
x = 33/6
x = 11/2
x = 11/2
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