Question

Question #5b0f3

Answer 1

See explanation below

Explanation:

`a-=b [mod n]`
a and b are congruent modulo n
`(a-b)` is a multiple of n (n divides (a-b))

`3x-=1 [mod 26]`
3x and 1 are congruent modulo 26
`(3x-1)` is a multiple of 26

`3x-1=26k`
where ##
k is an integer

`3x=26k+1`