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Simplifying 680 = 400 + 20c Solving 680 = 400 + 20c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-20c' to each side of the equation. 680 + -20c = 400 + 20c + -20c Combine like terms: 20c + -20c = 0 680 + -20c = 400 + 0 680 + -20c = 400 Add '-680' to each side of the equation. 680 + -680 + -20c = 400 + -680 Combine like terms: 680 + -680 = 0 0 + -20c = 400 + -680 -20c = 400 + -680 Combine like terms: 400 + -680 = -280 -20c = -280 Divide each side by '-20'. c = 14 Simplifying c = 14
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