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( - x + 1/5 - x³) - (1/2x - x³ - 4/5)
- x + 1/5 - x³ - 1/2x + x³ + 4/5
- x - 1/2x + 1/5 + 4/5 - x³ + x³
(-2x - x)/2x + (1 + 4)/5
3x/2x + 5/5
3x/2x + 1