20 less than 8 times a number is the same as 15 more than the number

20 less than ( - 20) 8 times a number (8x) is the same as (=) 15 more than ( + 15) the number (x).

8x - 20 = x + 15

To solve for the number, start by subtracting x from both sides.

7x - 20 = 15 Add 20 to both sides

7x = 35 Divide both sides by 7

x = 5