If 3 times a number is 28 more than its opposite what is the number

n = 7

Step-by-step explanation:

Let n represent the number. Then 3n = - n + 28, or 4n = 28.

Dividing both sides by 4 yields n = 7.

Check: "3 times a number" is 3n = 21

The "opposite" of the number is - 7.

If we add 28 to this "opposite," we get 21. This is correct: 21 = 21