To subtract unlike fractions, such as [tex]\frac{4}{7}[/tex] - [tex]\frac{2}{3}[/tex], first we need to find a common denominator. The common denominator of 7 and 3 is the least common multiple of 7 and 3 which is 21.
Notice that both of the fractions do not have 21 in their denominator, so we will have to get 21 in the denominator for both fractions.
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