Assuming that the underscore is a typo for the minus sign, the answer would be 0. Addition and subtraction are on the same level of precedence, so solve the problem from left to right:
(12+12)-12+12-24=
(24-12)+12-24=
(12+12)-24=
(24-24)=0
12 plus 12 is 24 minus 12 is 12 plus 12 is 24 again... I am sorry. The underscore has no explicit value. 👨✈️
=00
i,de say 1.24