Practice problem
Solve 7x+4≡3(mod9)7x+4\equiv 3\pmod{9}7x+4≡3(mod9).
x≡5(mod7)x\equiv 5\pmod{7}x≡5(mod7)
x≡3(mod9)x\equiv 3\pmod{9}x≡3(mod9)
x≡5(mod9)x\equiv 5\pmod{9}x≡5(mod9)
x≡8(mod9)x\equiv 8\pmod{9}x≡8(mod9)
Type a concept, like “slope” or “photosynthesis”.