Answer:
r = 72
Explanation:
1/6r + 2 = 1/9r + 6
1/6r - 1/9r = 6 - 2
3/18r - 2/18r = 6 - 2
1/18r = 4
r = 4 / 1/18
r = 4 * 18
3.4m questions
4.4m answers