Examples

3+4+3+3-2
Step 1
Add 3 and 4.
7+3+3-2
Step 2
Add 7 and 3.
10+3-2
Step 3
Add 10 and 3.
13-2
Step 4
Subtract 2 from 13.
11
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 [x2  12  π  xdx ] 
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