Answer:220

Step-by-step explanation:

1-3+4=100 after solving 2=100

4-6+9=999 after solving 7=999

2-6+7=879 after solving 3=879

We apply this to 3-3+6 = 6

Now we have to arrange (2,7,3) as it must gives us answer 6.

we can do like this 7–3+2=6

now replace value as instead of 7 put 999

instead of 3 put 879

instead of 2 put 100

we get 999–879+100=220

so answer is 3–3+6=220