Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$-6x+3y-3z$
Using $a(b+c)=ab+ac$ (or the Distributive Property), the given expression, $-3(2x-y+z) ,$ is equivalent to \begin{array}{l}\require{cancel} -3(2x)-3(-y)-3(z) \\\\= -6x+3y-3z .\end{array}