Question

3/7 + 4/21 - 13/14=3/42 +

Answer 1

+ - 
= 
=  
dikecilkan
= 

Answer 2

 3/7 + 4/21 - 13/14 = 3/42 + N 
( 3/7 + 4/21 - 13/14 = 3/42 + N ) x 7 (sederhanakan)
3 + 4/3 - 13/2 = 3/6 + 7N
3 + 8/6 - 39/6 = 3/6 + 7N ---> angka tebal di samakan penyebut
3 - 31/6 = 3/6 + 7N
18/6 - 31/6 = 3/6 + 7N 
- 13/6 = 3/6 + 7N
- 13/6 - 3/6 = 7N
- 16/6 = 7N
N = -16/(7 . 6)
N = - 16/42
N = - 8/21