#### Answer

$3(x-5)=108\div12$
$x=8$

#### Work Step by Step

$3(x-5)=108\div12$ $\longrightarrow$distributive property
$3x-15=108\div12$ $\longrightarrow$divide
$3x-15=9$ $\longrightarrow$addition property
$3x-15+15=9+15$ $\longrightarrow$simplify
$3x=24$ $\longrightarrow$multiplication property
$3x\div3=24\div3$ $\longrightarrow$simplify
$x=8$