W=8
H=12
V=1344
So to answer this, we fill in our variables;
1344=l*8*12
First we combine the width and height by multiplying them together;
1344=l*96
Then we simplify, remove the 96 by dividing it by itself, 96, and we do this to both sides to keep the equation equal:
1344/96=(l/96)*(96/96)
This creates your answer:
14=l