'3'
6 / 3 = 2
21/3 = 7
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what goes into both 21 and 25
The smallest number that both 21 and 23 can go into is 483.
3X + 6 = 21 subtract 6 from each side 3X = 15 divide both sides integers by 3 X = 5 =======check 3(5) + 6 = 21 15 + 6 = 21 21 = 21 ========checks
It is 21 because 21/21 = 1 and 21/7 = 3
21 6's go into 126.