simplify \big(-3 h^2 - 6 h x - 3 x^2\big)-\big(6 h + 6 x\big)+\big(4+3x^2+6x-4\big)simplify \big(-3 h^2 - 6 h x - 3 x^2\big)-\big(6 h + 6 x\big)+\big(4+3x^2+6x-4\big)

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