Question

Can someone find the error and explain?

Answer 1

$\huge\boxed{\text{There is no error.}}$

Note: I have checked my work multiple times. Consider informing your teacher of this.

We have $\frac{10n-5}{5}$ to start.

Factor out $5$ from the top expression. $\frac{5(2n-1)}{5}$

Cancel out the $5$s. $2n-1$

$2n-1=2n-1$