I probably will add correct precedence when I have less "real work" to do. I mainly did this as an exercise. It was a different type of problem then I normally solve.
For me the grouping by parens and constructing an "op" tree was a real tricky problem so I just had to beat my head off the wall until I figured it out.
Update
Done PEMDAS ordered. Assignment propagates left. i.e a=b=c=10 will assign a,b,c the value 10.
Code follows below.
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