Math

(-7x^9 +12x^6 -12)-(5x^9 +4x^6 -9)

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(-7x^9 +12x^6 -12)-(5x^9 +4x^6 -9)

-7x^9 +12x^6 -12-5x^9 -4x^6 +9

-7x^9-5x^9 +12x^6-4x^6 -12+9

-12x^9 8x^6 -3