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Simplifying (s2 + s + -1)(s2 + 5s + -7) = 0 Reorder the terms: (-1 + s + s2)(s2 + 5s + -7) = 0 Reorder the terms: (-1 + s + s2)(-7 + 5s + s2) = 0 Multiply (-1 + s + s2) * (-7 + 5s + s2) (-1(-7 + 5s + s2) + s(-7 + 5s + s2) + s2(-7 + 5s + s2)) = 0 ((-7 * -1 + 5s * -1 + s2 * -1) + s(-7 + 5s + s2) + s2(-7 + 5s + s2)) = 0 ((7 + -5s + -1s2) + s(-7 + 5s + s2) + s2(-7 + 5s + s2)) = 0 (7 + -5s + -1s2 + (-7 * s + 5s * s + s2 * s) + s2(-7 + 5s + s2)) = 0 (7 + -5s + -1s2 + (-7s + 5s2 + s3) + s2(-7 + 5s + s2)) = 0 (7 + -5s + -1s2 + -7s + 5s2 + s3 + (-7 * s2 + 5s * s2 + s2 * s2)) = 0 (7 + -5s + -1s2 + -7s + 5s2 + s3 + (-7s2 + 5s3 + s4)) = 0 Reorder the terms: (7 + -5s + -7s + -1s2 + 5s2 + -7s2 + s3 + 5s3 + s4) = 0 Combine like terms: -5s + -7s = -12s (7 + -12s + -1s2 + 5s2 + -7s2 + s3 + 5s3 + s4) = 0 Combine like terms: -1s2 + 5s2 = 4s2 (7 + -12s + 4s2 + -7s2 + s3 + 5s3 + s4) = 0 Combine like terms: 4s2 + -7s2 = -3s2 (7 + -12s + -3s2 + s3 + 5s3 + s4) = 0 Combine like terms: s3 + 5s3 = 6s3 (7 + -12s + -3s2 + 6s3 + s4) = 0 Solving 7 + -12s + -3s2 + 6s3 + s4 = 0 Solving for variable 's'. The solution to this equation could not be determined.
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