Variable $x$ cannot be equal to $1$ since division by zero is not defined. Multiply both sides of the equation by $8\left(x-1\right)$, the least common multiple of $2\left(x-1\right),x-1,8$.
$$4\times 5-8=3\left(x-1\right)$$
Multiply $4$ and $5$ to get $20$.
$$20-8=3\left(x-1\right)$$
Subtract $8$ from $20$ to get $12$.
$$12=3\left(x-1\right)$$
Use the distributive property to multiply $3$ by $x-1$.
$$12=3x-3$$
Swap sides so that all variable terms are on the left hand side.
