If you subtract 2x from each side you get 5x-0.15=0.6 because the subtraction of 2x on the right of the equal sign cancels out. Then, if you add 0.15 to both sides you will get 5x=0.75. Finally, if you divide both sides by 5 you get x = 0.15.
The store has a stock of <span>12 AA batteries and 15 9V batteries. So, these are the limits of the batteries that Mrs. Gibbs can only buy. She already bought 7 pieces of AA batteries. Then, she needs to buy only at least 20 batteries. Therefore, she should buy all of the stock of AA batteries which is 12 pieces.</span>
To be honest I don’t know I just need points