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(x+5)2 – (x–5)2 – 20x
x2 + 2(x)(5) + 5 al cuadrado - x2 - 2(x)(5) + 5 al cuadrado - 20x
x2 + 10x + 25 - (x2 -10x + 25) - 20x
x2 + 10x + 25 - x2 +10x - 25 - 20x
20x - 20x
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