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(1/7×2/9) (-3/14×1/9) (2/9×1/14)
=2/63-1/42+1/63
=LCM of 63,42,63 =2646
2/63×42/42=84/2646
-1/42×63/63= -63/2646
1/63×42/42=42/2646
84/2646-63/2646+42/2646
=84+42-63/2646
=63/2646
=1/42.
when you simplify 63/2646 you get 1/42.
your answer is 1/42.
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