simplify the following
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28/25+7/20-2/5
LCM of 25 ,20and 5= 2/20,25,5
2/10,25,5
5/5,25,5
5/1,5,1
1,1,1
2×2×5×5=100
LCM=100
112+35-40/100
147-40/100
107/100
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