tolong ya guys ku mohon ya?

3.) n + 3/7 = 2/3
n = -3/7 + 2/3 atau 2/3 - 3/7
n = 14/21 - 9/21
n = 5/21


4.) 6 2/3 + n = 9
20/3 + n = 9
n = 9 - 20/3
n = 9/1 - 20/3
n = 27/3 - 20/3
n = 7/3 atau 2 1/3


5.) 3/5 + n = 1 3/10 + 2 1/10
3/5 + n = 13/10 +21/10
3/5 + n = 34/10
n = 34/10 - 3/5
n = 34/10 - 6/10
n = 28/10 atau 2 8/10 atau 2 4/5


good luck (semoga membantu)