Plz solve this sum
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let no. be a/b
a/b*3/4=3a/4b
3a/4b+2/7=5/7
21a+8b/28b=5/7
7*(21a+8b)=5*28b
147a+56b=140b
147a=84b
a/b=84/147
by cutting weget
a/b=3/7
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