Could you please explain the answer, just so that I can understand how to solve this sort of problem next time

Question # 3: Consider the following algebraic expression: Result = a + b + b*c+ (a+b -c)/(a + b) + 4 (A) Write down the assembly code using LOAD, STOR, ADD, SUB, MULT, DIV, and HLT instructions. (B) Rewrite the code by using smallest number of instructions. (I did it with 12 instructions using only 2 temporary storage instructions.)