I start with 9-2x widgets. Each day, I produce 2x+1 widgets, and destroy 3-x widgets. After three days, how many widgets am I left with, in terms of x?
The net Aamount of widgets PER DAY is 2x+1 - (3-x) = 3x-2 w/d
started with 9-2x and added three days
9-2x + 3 * (3x-2) = widgets after three days ....expand and simplify