It is the multiplication result of 26 and 21 as they don't have any common number.
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63/78. You need to find a common factor of 63 and 78 and divide the fractions until they no longer have factors in common. Both 63 and 78 are divisible by 3. 21/26. 21 and 26 have no common factors so 21/26 is the lowest/simplest form.
How about: 3*7 = 21 or 1*21 = 21
the factors and the product.
factors and product
-26 - 21 = -47