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Simplifying cos(2x) + 7cosx + -3 = 0 Remove parenthesis around (2x) cos * 2x + 7cosx + -3 = 0 Reorder the terms for easier multiplication: 2cos * x + 7cosx + -3 = 0 Multiply cos * x 2cosx + 7cosx + -3 = 0 Reorder the terms: -3 + 2cosx + 7cosx = 0 Combine like terms: 2cosx + 7cosx = 9cosx -3 + 9cosx = 0 Solving -3 + 9cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 9cosx = 0 + 3 Combine like terms: -3 + 3 = 0 0 + 9cosx = 0 + 3 9cosx = 0 + 3 Combine like terms: 0 + 3 = 3 9cosx = 3 Divide each side by '9osx'. c = 0.3333333333o-1s-1x-1 Simplifying c = 0.3333333333o-1s-1x-1
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