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Simplifying z2 + 18z + c = 0 Reorder the terms: c + 18z + z2 = 0 Solving c + 18z + z2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-18z' to each side of the equation. c + 18z + -18z + z2 = 0 + -18z Combine like terms: 18z + -18z = 0 c + 0 + z2 = 0 + -18z c + z2 = 0 + -18z Remove the zero: c + z2 = -18z Add '-1z2' to each side of the equation. c + z2 + -1z2 = -18z + -1z2 Combine like terms: z2 + -1z2 = 0 c + 0 = -18z + -1z2 c = -18z + -1z2 Simplifying c = -18z + -1z2
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