I'm hoping you mean 5 and 6/7 - 2 and 2/3
5 and 6/7 = 41/7 = 123/21
2 and 2/3 = 8/3 = 56/21
123/21 - 56/21 = 67/21 or 3 and 4/21
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6and 2/3 -10 6.6666667-10 just use a calculator
Without an equality sign and not knowing the plus or minus values of some of the given terms it therefore follows that the given expression is meaningless.
I'd say 3 or 2and 1/2 what ever you believe is right.
Answer = 2 - (-3) = 2 + 3 = 5 minus minus means plus.
The answer is: 6 and 3/5 divided by 2 and 1/4 = 2 and 14/15