2/3 is technically 10/15. 1/5 is technically 3/15.
10/15 - 3/15 is 7/15.
If you make the denominator equal, it makes math a lot easier :)
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2/3 - 12 = -11 1/3 or minus eleven and one third.
(-1/6) - 2/3 = -0.8333333332
1 1/5 x 2 2/3 is 3 1/5
It is less than two thirds.
A negative minus a positive is a negative. i.e -1-(+1)= -2