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Simplifying 12c + 21 = 9c Reorder the terms: 21 + 12c = 9c Solving 21 + 12c = 9c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-9c' to each side of the equation. 21 + 12c + -9c = 9c + -9c Combine like terms: 12c + -9c = 3c 21 + 3c = 9c + -9c Combine like terms: 9c + -9c = 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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