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Anonymous
4 + 24 + x = 28 + x
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for n=4: (4 x 5) + 4 = 24
(x+4) (x+6)
Multiplying out the brackets: (x-6)(x+4) = x^2 -2x -24
4(x+6)
2 x 12 = 24 24 ÷ 6 = 4 4 x 8 = 32