5x = 0 (mod 6) 5x ≡ 0 (mod 6) 5x(mod 6) = 0 (mod6) 5x mod 6 = 0 mod 6
??
Sorry, it's really confusing and there are nothing about it in my lecture notes.
5x = 0 (mod 6) 5x ≡ 0 (mod 6) 5x(mod 6) = 0 (mod6) 5x mod 6 = 0 mod 6
??
Sorry, it's really confusing and there are nothing about it in my lecture notes.
Yes. These are several ways to express exactly the same thing. Namely, that $6$ divides $5x$.