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2._9x + 12x = 21x
3._-8x - 4x = -12x
4._x - 8x = -7x
5._9x³ + 5x³ = 14x³
6._6x - 9x = -3x
7._-5x² + 9x² = 4x²
8._4x + x = 5x
9._8x² - 3x³ = se queda igual :P