Question

When a number is doubled and the result is decreased by 9, the answer is 19. Find the number

Answer 1

According to the quesion :

let the number be x

✏ 2x + 9 =19

✏ 2x = 19-9

✏ 2x = 10

✏ x = 5

Answer 2

Answer:

$2x + 9 = 19 \\ 2x = 19 - 9 \\ x = \frac{10}{2} \\ x = 5$

hope it works