Least common denominator

-2/5y, 10/2y
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If this is meant to read -(2/5)y, (10/2)y, the LCD is 5 because (10/2)=5 so there is only one fraction. If it’s -2/(5y), 10/(2y), that is, -2/(5y), 5/y, then the LCD is 5y.

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