25-{27:[(36-27:3):3]+42:7×3}
25-{27:[(36-9):3]+42:7×3}
25-[27:(27:3)+42:7×3]
25-(27:9+42:7×3)
25-(3+6×3)
25-(3+18)
25-21
4
136×25-(324:2:9×3+41)+146-123:3
136×25-(162:9:3+41)+146-123:3
136×25-(18:3+41)+146-123:3
136×25-(54+41)+146-123:3
136×24-95+146-123:3
3400-95+146-41
3305+146-41
3451-41
3410
