Taehyung is 5 years older than his younger brother, and this year Taehyung's younger brother is 7 years old. How old is his mother when the age difference between Taehyung and his mother is 31 years?
7 5 [OP_ADD] 31 [OP_ADD]
var_a = 7
var_b = 5
var_c = var_a + var_b
var_d = 31
var_e = var_c + var_d
print(int(var_e))