It's just maths

Lets figure this one out

84/3 is 28 = LA Rams

2 panthers Minus 28 = 34 2x - 28=34 add 28 to 34 and divided by 2 gives us

31 = the Panthers

2x - 31= 17 add 31 to each side and divide by 2 gives us

24 = Da Bears

24 - 31 + 28 = 21 for the final answer!