12+6−4+18−12= 12+6-4+18-12= 12+6−4+18−12=
Due to the fact that the exercise only involves addition and subtraction operations, we will solve it from left to right:
12+6=18 12+6=18 12+6=18
18−4=14 18-4=14 18−4=14
14+18=32 14+18=32 14+18=32
32−12=20 32-12=20 32−12=20
20 20 20