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partial fraction decomposition 9kx/(9-10x) + 9(k-1)x^2/((1-x)(9-10x)) - 9x^3/((1-x)^2(9-10x))
partial fraction decomposition 9kx/(9-10x) + 9(k-1)x^2/((1-x)(9-10x)) - 9x^3/((1-x)^2(9-10x))
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