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3*x*3+x*2+x+1/2+(‑x)*2+9
(3x³ + x² + x + 1/2) + (- x² + 9)
3x³ + x² + x + 1/2 - x² + 9
3x³ + x² - x² + x +1/2 + 9
3x³ + x + 1/2 + 9
3x³ + x + (1 + 18)/2
3x³ + x+ (19)/2
3x³ + x + 19/2