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8 April, 20:08

Squaring a number and subtracting 6 gives the same result as doubling the number and adding 9.

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  1. 8 April, 20:21
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    The answer is 5.

    5^2 = 25 25 - 6 = 19

    5 x 2 = 10 10 + 9 = 19
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