<prompt> Ikiwa x equiv 4 pmod19 na y equiv 7 pmod19, basi tafuta salio wakati x 12 y 53 imegawanywa na 19 .  <response>: Ikiwa x equiv 4 pmod19 na y equiv 7 pmod19, basi anzaalignx 12 y 53 sawa na 52 cdoti 123 sawa 25 cdot 1728 sawa 6 cdot 18 sawa 108 sawa 13 pmod19.mwishopanga 