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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
2/7 = 5/(3*x-1) // - 5/(3*x-1)
2/7-(5/(3*x-1)) = 0
2/7-5*(3*x-1)^-1 = 0
2/7-5/(3*x-1) = 0
(-5*7)/(7*(3*x-1))+(2*(3*x-1))/(7*(3*x-1)) = 0
2*(3*x-1)-5*7 = 0
6*x-37 = 0
(6*x-37)/(7*(3*x-1)) = 0
(6*x-37)/(7*(3*x-1)) = 0 // * 7*(3*x-1)
6*x-37 = 0
6*x-37 = 0 // + 37
6*x = 37 // : 6
x = 37/6
x = 37/6
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