Ответ:

а) \(43x + 19x = 12\,710\)

\(62x = 12\,710\)

\(x = 12\,710 : 62 = 205\)

б) \(60y - 3y = 15\,390\)

\(57y = 15\,390\)

\(y = 15\,390 : 57 = 270\)

в) \(7m + m - 12 = 28\)

\(8m - 12 = 28\)

\(8m = 40\)

\(m = 5\)

г) \(16t - t + 5 = 50\)

\(15t + 5 = 50\)

\(15t = 45\)

\(t = 3\)

Ответ: а) \(x = 205\); б) \(y = 270\); в) \(m = 5\); г) \(t = 3\).