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• (4-9) / (3(x^2-4))
• -5 / 3x^2-12
= (4 / 3 (x^2-4)) - (3 / (x^2-4))
= (4 / 3 (x^2-4)) - (9 / 3 (x^2-4))
= -5 / 3 (x^2-4)