As use ooh wall

4+4+4+4+4= 20

20-5= 15

20+15= 35

35-5= 30

30-15= 15

20-15= 5

4-2= 2

5+2= 7

7+7= 1

WARNING: CRAZY STUFF AFTER THIS

1+5= 3

60+4= 300

3+1 = TRIANGLE

1+0= EYE