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If I read this correctly, you're asking to solve the equation (x + 3)2 = (x + 2)2 + 13.

That becomes x2 + 6x + 9 = x2 + 4x + 4 + 13

6x + 9 = 4x + 17

2x = 8

x = 4

Check it.

49 = 36 + 13

It checks.

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13y ago

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