Yes the results is -4 :D
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When you subtract 16 2/3 from 7 7/8 you will get 211/24 as a mixed number.
-3
If you mean 8 and 7/12 subtract 2 and 3/8 then it is 6 and 5/24
9
x + 7 = 3 Subtract 7 from both sides: x = 3-7 = -4