First of all, the 5-digit X4 is still 5 digits, so learning from X4+ (decimal number) = may be 1 or 2 (more than 3 will become 6 digits), so learning may be 5 6 7 8 9, learning X4= learning from it =2 =8 small =12 (more than 3 will carry, which is inconsistent with the meaning of the question) and 5 characters. Love X4+3(4X7=28, so carry 3) comes last or love so love =9.

This translation is 2 1978X4=879 12.