m = 26 + 4n mn = 464 These combine to: 464/n = 26 + 4n This can be re-arranged to: Then factored to: n = 8 and/or Discard negative (and non-integral) solution: and Check: 8*58 = 464 (ok) and 26+4*8 = 26+32 = 58 (ok)