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4/7-3/4=
firs you want to get both numbers to have the same denominator and 7 and 4 are both multiples of 28, so make 28 the demoninator.
4/7-3/4= ?/28-?/28 <<< so what times 7 gives you 28 and what times 4 gives you 28? you use that answer to replace the question mark, but you have to multiply it by the numbers that were already in the numerator (3 and 4).
so now you have 4(4)/28-3(7)/28= 16/28-21/28=-5/28
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