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Simplifying 40cos2x + cosx + -15 = 0 Reorder the terms: -15 + cosx + 40cos2x = 0 Solving -15 + cosx + 40cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '15' to each side of the equation. -15 + cosx + 15 + 40cos2x = 0 + 15 Reorder the terms: -15 + 15 + cosx + 40cos2x = 0 + 15 Combine like terms: -15 + 15 = 0 0 + cosx + 40cos2x = 0 + 15 cosx + 40cos2x = 0 + 15 Combine like terms: 0 + 15 = 15 cosx + 40cos2x = 15 Reorder the terms: -15 + cosx + 40cos2x = 15 + -15 Combine like terms: 15 + -15 = 0 -15 + cosx + 40cos2x = 0 The solution to this equation could not be determined.
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