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If m/n=4/3 and r/t=9/(14) , the value ...

If `m/n=4/3` and `r/t=9/(14)` , the value of `(3m r-n t)/(4n t-7m r)` is `5 1/2` (b) `-(11)/(14)` (c) `-1 1/4` (d) `(11)/(14)`

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