Asked by Isha

6x= 15(mod21
Answered by oobleck
so, 6x = 21k+15 for any integer k
2x = 7k+5
so, since 2x is even, 7k must be odd, so k is odd
So, picking values of k,
k=1: x = 6
k=3: x=13
and so on.
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