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x and y could be a variety of things, you would need some thing like "y=4" or something similar.

With just "x+y=9", it could be:

0+9=9

1+8=9

2+7=9

3+6=9

4+5=9

5+4=9

6+3=9

7+2=9

8+1=9

9+0=9

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Wiki User

13y ago

What else can I help you with?