I think of a number. I multiply it by 7. I add 12. The result is 40. What is the number I am thinking of?

If you could answer these your a life saver

Sally deposited money into a savings account paying 4% simple interest per year.the first year,she earned $75 in interest.how much interest will she earn during the following year?

Solve 17= -13 - 8x and show your work.