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Simplifying 7cos2x + 16cosx + 9 = 0 Reorder the terms: 9 + 16cosx + 7cos2x = 0 Solving 9 + 16cosx + 7cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + 16cosx + -9 + 7cos2x = 0 + -9 Reorder the terms: 9 + -9 + 16cosx + 7cos2x = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 16cosx + 7cos2x = 0 + -9 16cosx + 7cos2x = 0 + -9 Combine like terms: 0 + -9 = -9 16cosx + 7cos2x = -9 Reorder the terms: 9 + 16cosx + 7cos2x = -9 + 9 Combine like terms: -9 + 9 = 0 9 + 16cosx + 7cos2x = 0 The solution to this equation could not be determined.
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