If 3y+9x=54 and (28 x)/(13 y)=(140)/(39)...

If `3y+9x=54` and `(28 x)/(13 y)=(140)/(39)` , then what is the value of `y-x` ? `-2` (b) `-1` (c) `1` (d) 2 (e) None of these

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