// I don't know what I am supposed to do. But looking the equation, I think we solve for t. But again, I am not sure.
3t - 321 lb = _____ lb
First, add 321 on both sides.
3t = 321 lb.
Divide both side by 3.
t = 107 lbs.
3t - 321 lb. = 107 lb.
//Hope this helps
