1/8 + 1/4
2/3 - 5/9
1/2 - 5/12
5/12 - 2/9
1/8 + 7/12 
Помогите:с 
Желательно с разбором 
ПРИМЕР:
1/2 + 1/3 = 3/6 + 2/6 = 5/6
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