12 minus 3 of 8 minus 1 of 8 minus 1 of 2

12 minus 3 of 8 minus 1 of 8 minus 1 of 2

12-3/8-1/8-1/2
=12-(3/8+1/8+1/2)
=12-(1/2+1/2)
=12-1
=11