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Let's call the unknown number x.

We want for what number(s) is x + 2x > x -1 true.

x + 2x > x -1

Combine like terms:

3x > x - 1

Subtract x from each side:

2x > -1

Divide each side by 2:

x > -1/2

Any number greater than -1/2 will work.

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