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There are infinitely many ways.
Let X be any positive number greater than 28.99. There are infinitely many possible values of X.
Let Y = 840/X
Then X*Y = X*(840/X) = 840
Since there were infinitely many choices for X there are infinitely many possible solutions for two numbers that multiply to 840.
Also, if (X, Y) is a solution then so is (-X, -Y).
Next, there are infinitely many triplets, quadruples, ... n-tuples that are solutions.
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