Examples

5x2-6x+17+8x2+8x+3
Step 1
Add 5x2 and 8x2.
13x2-6x+17+8x+3
Step 2
Add -6x and 8x.
13x2+2x+17+3
Step 3
Add 17 and 3.
13x2+2x+20
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 [x2  12  π  xdx ] 
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