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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*x+5)/(3*x-1) = 3.5 // - 3.5
(2*x+5)/(3*x-1)-3.5 = 0
(2*x+5)/(3*x-1)+(-3.5*(3*x-1))/(3*x-1) = 0
2*x-3.5*(3*x-1)+5 = 0
8.5-8.5*x = 0
(8.5-8.5*x)/(3*x-1) = 0
(8.5-8.5*x)/(3*x-1) = 0 // * 3*x-1
8.5-8.5*x = 0
8.5-8.5*x = 0 // - 8.5
-8.5*x = -8.5 // : -8.5
x = -8.5/(-8.5)
x = 1
x = 1
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