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Simplifying (7 + -1d + -1e)(7 + d + e) = 0 Multiply (7 + -1d + -1e) * (7 + d + e) (7(7 + d + e) + -1d * (7 + d + e) + -1e * (7 + d + e)) = 0 ((7 * 7 + d * 7 + e * 7) + -1d * (7 + d + e) + -1e * (7 + d + e)) = 0 ((49 + 7d + 7e) + -1d * (7 + d + e) + -1e * (7 + d + e)) = 0 (49 + 7d + 7e + (7 * -1d + d * -1d + e * -1d) + -1e * (7 + d + e)) = 0 Reorder the terms: (49 + 7d + 7e + (-7d + -1de + -1d2) + -1e * (7 + d + e)) = 0 (49 + 7d + 7e + (-7d + -1de + -1d2) + -1e * (7 + d + e)) = 0 (49 + 7d + 7e + -7d + -1de + -1d2 + (7 * -1e + d * -1e + e * -1e)) = 0 Reorder the terms: (49 + 7d + 7e + -7d + -1de + -1d2 + (-1de + -7e + -1e2)) = 0 (49 + 7d + 7e + -7d + -1de + -1d2 + (-1de + -7e + -1e2)) = 0 Reorder the terms: (49 + 7d + -7d + -1de + -1de + -1d2 + 7e + -7e + -1e2) = 0 Combine like terms: 7d + -7d = 0 (49 + 0 + -1de + -1de + -1d2 + 7e + -7e + -1e2) = 0 (49 + -1de + -1de + -1d2 + 7e + -7e + -1e2) = 0 Combine like terms: -1de + -1de = -2de (49 + -2de + -1d2 + 7e + -7e + -1e2) = 0 Combine like terms: 7e + -7e = 0 (49 + -2de + -1d2 + 0 + -1e2) = 0 (49 + -2de + -1d2 + -1e2) = 0 Solving 49 + -2de + -1d2 + -1e2 = 0 Solving for variable 'd'. The solution to this equation could not be determined.
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