Question

-3(4v+1)-3(2v+3) how do you simplify

Answer 1

$-3(4v+1)-3(2v+3) =\\ -12v-3-6v-9=\\ -18v-12$

Answer 2

First you have to multiply the numbers out of the paranthesis, with the numbers in it:
$-3(4v+1)-3(2v+3)\\ -3\cdot 4v-3\cdot 1-3\cdot 2v-3\cdot 3$ 
then solve :
$-12v-3-6v-9\\ -18v-12$