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Hey mate here is ur answer....
Step-by-step explanation:
First we will add 3/4 , 5/7 , 7/12
Then,,
3/4 + 5/7 + 7/12
61 + 60 + 49
__________
84
170
= ____
84
Then subtraction:-
170/84 - [2/7 - 5/21]
170/84 - [21 - 5]/21
170/84 - 16/21
(170 - 64)/21
106/21
= 1
5______
21
....
Hence , this will be the answer..
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