Mathematics, 18.02.2021 20:40 worstell

Perform the operation.
(−3x^2+9x−9)+(−9x^2+9x+3)
I will give brainleist

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You know the right answer?

Perform the operation.
(−3x^2+9x−9)+(−9x^2+9x+3)
I will give brainleist...