Answer: multiply left and multiply right, then subtract them
Explanation:
Sample Left: 6 x 3 - 4 x 3 = x
18 - 12 = x
6 = x
Sample: Middle 7 x 4 - 9 x 2 = x
28 - 18 = x
10 = x
Sample: Right 7 x 3 - 0 x 7 = x
21 - 0 = x
21 = x
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