-72*(1/4-5/9+7/12)/(-2)

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-72*(1/4-5/9+7/12)/(-2)
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-72*(1/4-5/9+7/12)/(-2)
-72*(1/4-5/9+7/12)/(-2)

-72*(1/4-5/9+7/12)/(-2)
-72*(1/4-5/9+7/12)/(-2)
=(-18+40-42)/(-2)
=-20/(-2)
=10