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Nothing can go evenly into 21 or 17. They are both odd numbers and therefore cannot be evenly divided.
2z+17=21 subtract 17 from both sides. 2z=4 divide both sides by 2 z=2
what goes into both 21 and 25
The smallest number that both 21 and 23 can go into is 483.
21 can go into 38 one time. It'll have a remainder of 17.