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$(2x^2 - 3x + 1) + (7x^2 + 10x + 8)$
Step1: Agrupar términos semejantes
$(2x^2 + 7x^2) + (-3x + 10x) + (1 + 8)$
Step2: Sumar coeficientes de $x^2$
$2 + 7 = 9$, así que $9x^2$
Step3: Sumar coeficientes de $x$
$-3 + 10 = 7$, así que $7x$
Step4: Sumar términos constantes
$1 + 8 = 9$
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$9x^2 + 7x + 9$