How does 2x81 equal 1521 So confusedSolution2x811521 is true

How does 2x8+1 equal 1521? So confused.

2x8+1=1521 is true under the modulo 8 system of number.

LHS: 2*8+1 = 1 (mod 8)

RHS:1521(mod8)= The remainder after 1521 is divided by 8 =1, as 1521 divided by 8=190 quotient + 1 remainder.

Therefore, LHS=RHS , in modular 8 system.

Also LHS: 2x8+1 = 1 (Mod16) and

RHS= 1(Mod16) .So under the,mod16 number system also the given relation is congruent.