## Precalculus (6th Edition) Blitzer

$8x-(3x+6)$ $5x-6$
$8$ times $x$ is $8x$. $3$ times $x$ is $3x$. Six more than that is $3x+6$. The difference between $8x$ and $3x+6$ is $8x-(3x+6)=8x-3x-6=5x-6$.