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First change the fractions to improper fractions.
6 2/7 = 44/7
As you can see, I multiplied the whole number by the denominator and added 2 to the numerator.
2 3/4 = 11/4
(44/7) / (11/4)
In order to multiply fractions, we invert the divisor and multiply.
(44/7) * (4/11) = 176/77 = 2 2/7