86 - 19 = 67
2/3 + 24/7 = 86/21 or 42/21
86 * 19 = 1,634
x - 8/3 = -86/21 Add 8/3 to each side: x = -10/7
3 into 63 is 21.
19+2 are two prime numbers that add up to 21
19/21. 4/7 + 3/9 = 36/63 + 21/63 = 57/63 = 19/21.
If you add 9+10 you would got 19
21/86 cannot be simplified.
-19
You add the numbers, then divide the result by 3. In this case you divide by 3 because there are 3 numbers.
151