Mathematics

# -7z+2z-3z-7=17 how do you solve using addition and multiplication principles

$-7z+2z-3z-7=17\\ -8z=24\\ z=-3$
$Answer :$  $-7z+2z-3z-7=17 -7-17=7z-2z+3z \\ -24=8z \\ -24/8=z \\ -3=z$