$2v-4v-8=5\left( v+4 \right)$
Distribute $5$ through the parentheses$2v-4v-8=5v+20$
Collect like terms$-2v-8=5v+20$
Move the variable to the left-hand side and change its sign$-2v-8-5v=20$
Move the constant to the right-hand side and change its sign$-2v-5v=20+8$
Collect like terms$-7v=20+8$
Add the numbers$-7v=28$
Divide both sides of the equation by $-7$$v=-4$