The product of a twice a number and 3 is the same as the difference of 5 times the number and 3/4 find the number

Find the lateral surface area plzzz

What is the pattern in the values as the exponents increase?

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.