simplify -5/7+-7/9-9/11
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-5/7+-7/9-9/11
= -5/7-7/9-9/11
Lcm of 7, 9 and 11
= 7 X 9 X 11
=693
Multiply denominators and numerators
=(-5X99 -7 X 77 -9 X63)/693
=-495-539-567/693
=-1601/693
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