Solve using properties 1/7×2/9-3/14×1/9+2/9×1/14 .

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Solution

(1/7 x 2/9) - (3/14 x 1/9) +(2/9 x 1/14)
=2/63-3/126+2/126
= 2/63 - (3/126-2/126)
=2/63 -1/126
=4/126 - 1/126
= 3/126
=1/42

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