Solve 5x≡2(mod7)5x \equiv 2 \pmod 75x≡2(mod7).
x≡6(mod7)x \equiv 6 \pmod 7x≡6(mod7)
x≡3(mod7)x \equiv 3 \pmod 7x≡3(mod7)
x≡4(mod7)x \equiv 4 \pmod 7x≡4(mod7)
x≡1(mod7)x \equiv 1 \pmod 7x≡1(mod7)