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x²+10x+25+x²+10x-25-20x=0
2x²=0
x=0
porque esto es un cuadrado perfecto (x+5)²
por lo tanto:
(x+5)²– (x–5)² – 20x
x²+10x+25-x²+10x-25-20x
reduces terminos semejantes y nos queda
20x-20x=0