-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)=36*(1/4

-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)
=36*(1/4-5/9+7/12)
=36*1/4-36*5/9+36*7/12
=9-20+21
=10