Multiply each term by $x\left(x − 1\right)$.
Simplify.
Solve.

$\frac{x(x-1)(x)}{x-1}-\frac{x(x-1)}{x(x-1)}=3x(x-1)$

$x^{2} − 1 = 3x^{2} − 3x$
$2x^{2} − 3x + 1 = 0$
$\left(2x − 1\right)\left(x − 1\right) = 0$

$x=\frac{1}{2}\text{ or }x\neq 1 \text{ undefined}$

Use a similar process as part (a).