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Simplifying -7cos(3x) + -5 = 0 Remove parenthesis around (3x) -7cos * 3x + -5 = 0 Reorder the terms for easier multiplication: -7 * 3cos * x + -5 = 0 Multiply -7 * 3 -21cos * x + -5 = 0 Multiply cos * x -21cosx + -5 = 0 Reorder the terms: -5 + -21cosx = 0 Solving -5 + -21cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -21cosx = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -21cosx = 0 + 5 -21cosx = 0 + 5 Combine like terms: 0 + 5 = 5 -21cosx = 5 Divide each side by '-21osx'. c = -0.2380952381o-1s-1x-1 Simplifying c = -0.2380952381o-1s-1x-1
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