Find xxx such that x2≡1(mod8)x^2 \equiv 1 \pmod{8}x2≡1(mod8).
x∈{1,7}x \in \{1, 7\}x∈{1,7}
x∈{1,3,5,7}x \in \{1, 3, 5, 7\}x∈{1,3,5,7}
x∈{1,3}x \in \{1, 3\}x∈{1,3}
x∈{1,5}x \in \{1, 5\}x∈{1,5}