if a/b=5/7, then find the value of 7a+4b / 7a-4b
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given,
a/b=5/7
a=5
b=7
7a+4b= 7×5+4×7
=63
7a-4b= 7×5-4×7
=7
therefore, 7a+4b/7a-4b= 63/7
= 9
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