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Simplifying 21 + 5c = 8c Solving 21 + 5c = 8c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-8c' to each side of the equation. 21 + 5c + -8c = 8c + -8c Combine like terms: 5c + -8c = -3c 21 + -3c = 8c + -8c Combine like terms: 8c + -8c = 0 21 + -3c = 0 Add '-21' to each side of the equation. 21 + -21 + -3c = 0 + -21 Combine like terms: 21 + -21 = 0 0 + -3c = 0 + -21 -3c = 0 + -21 Combine like terms: 0 + -21 = -21 -3c = -21 Divide each side by '-3'. c = 7 Simplifying c = 7
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