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(3x³ + x² + x + 1/2) + (- x² + 9)
3x³ + x² + x + 1/2 - x² - 9
Agrupas los términos semejantes.
3x³ + x² - x² + x + 1/9 - 9
3x³ + x + 1/9 - 9
3x³ + x + (1 - 81)/9
3x³ + x + (- 80)/9
3x³ + x - 80/9