Set up a determinant:

| i j k | | 5 0 3 | | 7 7 9 |

Now calculate the determinant, using the first row as your cofactors: (0 - 21)i - (45 - 21)j + (35 - 0)k = -21i - 24j + 35k

The cross product is the vector -21i + 24j + 35k

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