The answer to the riddle is I_SO_LATE_ME! (the underscores are the squares.
1. 3x+2=5 (o)
2. 4+9+5+x=2x (square)
3. x/4+7=12 (a)
4. 2x+3=12 (e)
5. 7x=42 (!)
6. x/5=3 (e)
7. 2x+3x+4=12 (s)
8. 3x-2=5 (square)
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Sorry this is not the answer but I think it will help majorly it you can replace the unknown numbers with random ones and just keep on switching it out. Hope it helps a bit. :)
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