Lab 6.2

8.
a. 
   5   z
    \ /
     -   x
      \ /
   Y   +
    \ /
     =
b.
     z   x
      \ / 
       +
   5 (EXP)
    \ /
  Y  -
   \ /
    =
c.
     z   x
      \ / 
       +
     (EXP)  2
        \  /
          /
         /
  5 (  EXP  )
  \   /
Y   -
 \ /
  =
9.
y=x-3*2
y=(x-3)+z 
y=x-(3*(z/2))