#### Answer

$-23m-2$

#### Work Step by Step

The distributive property holds that $a(b+c)=ab+ac$ (for real numbers $a$, $b$, and $c$).
We are given the expression $-(7m-12)-2(4m+7)-8m$. We can use the distributive property to simplify the terms in parentheses and combine like terms.
$-(7m-12)-2(4m+7)-8m=(-1\times7m)+(-1\times-12)+(-2\times4m)+(-2\times7)-8m=(-7m)+(12)+(-8m)+(-14)-8m=(-7-8-8)m+(12-14)=(-23)m+(-2)=-23m-2$