1.Write this sentence as an equation. Do not solve it. Two times the difference of three times a number and seven is a number.

7.B'Elanna Torres tries to combine her like terms in 3(2x+4)-2x and got out 16x but Tom Paris thinks she made a mistake. It is your job to explain her mistake and solve the problem correctly.
Mistake: 3(2x+4)-2x=16x

3.The YMCA has a new rectangular pool with a perimeter of 108ft. The deep ends length is d ft. The shallow ends length is 15 ft. MacGyver knows that the width of the entire pool is 3 ft less than the deep ends length and can be represented by d-3.Solve for d.​