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solve a*x_1^3 + b*x_1^2 + c*x_1 + d = x_1, 3a * x_1^2 + 2b*x_1 + c = 1, a*x_2^3 + b*x_2^2 + c*x_2 + d = 1, 3a*x_2^2 + 2b*x_2 + c = 0
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