The answer to your question is eight. =]
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Negative 8 minus 12 is negative 20.
-20 negative 20 minus 20
Expressed as a proper fraction in its simplest form, 11/12 - 9/20 = 7/15
20 and 3/4 minus 18 and 2/3 = 2 and 1/12
minus 21 think of it as 12+9 which equals 21 then just whack a minus sign infront