Question

When three times a certain number is subtracted from 15, the result is -6. Find the number

Answer 1

x = 7

just let the unknown be x and you multiply x by 3 making it 3x

subtract 3x from 15 equating it with 6

ie

15 - 3x = -6

3x = 15 + 6

3x = 21

divide both sides by 3

Answer 2

7

Explanation:

Turn the words into algebra

3 times n is subtracted from 15 so 15-3n = -6, so

-3n = -6 - 15

-3n = -21 so n = 7