Answer:
36
Step-by-step explanation:
I think you meant to put 3x +7. anyhow, i'll use numbers 1, 2, and 3. that would be 10, 13, and 16.
If your friend made $20 dollars they made 2/3 of the money, and you got 1/3 of the total money then that means you made $10 dollars.
Do -104 negitiive 8 times.then you will have it.