# How do you factor the expression 5x-8x?

$- 3 x$
Subtract them as though they ($5$ and $8$) were regular numbers and add $x$ at the end: $- 3 x$
Or factor out the GCF of $x$: $x \left(5 - 8\right) = x \left(- 3\right) = - 3 x$