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maybe eight 21 - 5 = 16 = 2 x 8
5 + 2 + 3 + 7 + (21/7) = 20
16 + 5 = 21
There is no variable, and the equation is not valid.
22/21 = 1 1/21. The common denominator is 21, so 5/7 = 15/21, and 1/3 = 7/21. Add 15/21 + 7/21 = 22/21. Then change to mixed number.