Question

$$\log_{a}x+\log_{a}(x-3)=\log_{a}10$$

Solve for a (complex solution)

$a\in \mathrm{C}\setminus 0,1$
$x=5$

Solve for x (complex solution)

$x=5$
$a\neq 1\text{ and }a\neq 0$

Solve for a

$a\in \left(0,1\right)\cup \left(1,\infty\right)$
$x=5$

Solve for x

$x=5$
$a\neq 1\text{ and }a>0$