Answer:
9/20+3(4-1)-7+
BODMAS stands for B-Brackets, O-Orders (powers/indices or roots), D-Division, M-Multiplication, A-Addition, S-Subtraction.
=9/2+12-3-7+
Brackets is solved ..........3(4-1
=9/2+12-3-7+8 Orders(powers................

=4.5+12-3-7+8 Division.............................9/2
=16.5-3-1 Addition..............................4.5+12 & -7+8
=12.5