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2x³ - 5x³ = (2 - 5)x³ = -3x³
3x⁴ - 2x⁴ + 7⁴ = (3 - 2)x⁴ + 2401 = x⁴ + 2401
2a²bc³ - 5a²bc³ + 3a²bc³ - 2a²bc³ = (2 - 5 + 3 - 2)a²bc³ = -2a²bc³