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I think one or both of those have to be negative.
-3 + 7 = 4
-3 x 7 = -21
3 + -7 = -4
3 x -7 = -21
7 x 3 = 21
7 - 3 = 4
It also works if you subtract.
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∙ 12y ago
Anonymous
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109
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20
