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Simplifying 2cosx + -7cosx + -4 = 0 Reorder the terms: -4 + 2cosx + -7cosx = 0 Combine like terms: 2cosx + -7cosx = -5cosx -4 + -5cosx = 0 Solving -4 + -5cosx = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -5cosx = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5cosx = 0 + 4 -5cosx = 0 + 4 Combine like terms: 0 + 4 = 4 -5cosx = 4 Divide each side by '-5osx'. c = -0.8o-1s-1x-1 Simplifying c = -0.8o-1s-1x-1
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