15
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18 because 18/18=1 and 36/18=2. they are both divisible by 18 and 18 cant be divided equally by any higher number
18
you do this by 18*18
x - 18 = 34 just add 18 to both sides... X - 18 + 18 = 34 + 18 x + 0 = 52 x = 52
1,2,3,6,9, and 18