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Simplifying -81(1 + -3c) = 40 (1 * -81 + -3c * -81) = 40 (-81 + 243c) = 40 Solving -81 + 243c = 40 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '81' to each side of the equation. -81 + 81 + 243c = 40 + 81 Combine like terms: -81 + 81 = 0 0 + 243c = 40 + 81 243c = 40 + 81 Combine like terms: 40 + 81 = 121 243c = 121 Divide each side by '243'. c = 0.4979423868 Simplifying c = 0.4979423868
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