-14
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4/3 minus 5/7 = 13/21
12/21 - 7/21 = 5/21
1/3 minus 1/7 is 4/21.
33/7 - 22/21 the least common denominator is 21 = (33 x 3)/(7 x 3) - 22/21 = 99/21 - 22/21 = 77/21 = (77 ÷ 7/(21 ÷ 7) = 11/3 =3 2/3
If you mean: 5x/7 -6 = x then x = -21