a) 13 × x = 117x = 117 : 13x = 9
б) 187 : y = 17y = 187 : 17y = 11
в) x : 19 = 16x = 16 × 19x = 304
г) (14 + y) × 13 = 22114 + y = 221 : 1314 + y = 17y = 17 - 14y = 3