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= (2x^2+5x-12x-30)+(12x^2+9x-4x-3)
= (2x^2-7x-30)+(12x^2+5x-3)
= 14x^2-2x-33
= (2×^+5×-12×-30)+(12×^+9-4×-3)
= (2×^-7×-30)+(12×^-4×+6)
=14×^-11×-24