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Simplifying 680 = 400 + 21c Solving 680 = 400 + 21c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-21c' to each side of the equation. 680 + -21c = 400 + 21c + -21c Combine like terms: 21c + -21c = 0 680 + -21c = 400 + 0 680 + -21c = 400 Add '-680' to each side of the equation. 680 + -680 + -21c = 400 + -680 Combine like terms: 680 + -680 = 0 0 + -21c = 400 + -680 -21c = 400 + -680 Combine like terms: 400 + -680 = -280 -21c = -280 Divide each side by '-21'. c = 13.33333333 Simplifying c = 13.33333333
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