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Simplifying (c2 + c + -1)(c2 + 7c + -9) = 0 Reorder the terms: (-1 + c + c2)(c2 + 7c + -9) = 0 Reorder the terms: (-1 + c + c2)(-9 + 7c + c2) = 0 Multiply (-1 + c + c2) * (-9 + 7c + c2) (-1(-9 + 7c + c2) + c(-9 + 7c + c2) + c2(-9 + 7c + c2)) = 0 ((-9 * -1 + 7c * -1 + c2 * -1) + c(-9 + 7c + c2) + c2(-9 + 7c + c2)) = 0 ((9 + -7c + -1c2) + c(-9 + 7c + c2) + c2(-9 + 7c + c2)) = 0 (9 + -7c + -1c2 + (-9 * c + 7c * c + c2 * c) + c2(-9 + 7c + c2)) = 0 (9 + -7c + -1c2 + (-9c + 7c2 + c3) + c2(-9 + 7c + c2)) = 0 (9 + -7c + -1c2 + -9c + 7c2 + c3 + (-9 * c2 + 7c * c2 + c2 * c2)) = 0 (9 + -7c + -1c2 + -9c + 7c2 + c3 + (-9c2 + 7c3 + c4)) = 0 Reorder the terms: (9 + -7c + -9c + -1c2 + 7c2 + -9c2 + c3 + 7c3 + c4) = 0 Combine like terms: -7c + -9c = -16c (9 + -16c + -1c2 + 7c2 + -9c2 + c3 + 7c3 + c4) = 0 Combine like terms: -1c2 + 7c2 = 6c2 (9 + -16c + 6c2 + -9c2 + c3 + 7c3 + c4) = 0 Combine like terms: 6c2 + -9c2 = -3c2 (9 + -16c + -3c2 + c3 + 7c3 + c4) = 0 Combine like terms: c3 + 7c3 = 8c3 (9 + -16c + -3c2 + 8c3 + c4) = 0 Solving 9 + -16c + -3c2 + 8c3 + c4 = 0 Solving for variable 'c'. The solution to this equation could not be determined.
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