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Simplifying 12c + -21 = 3c Reorder the terms: -21 + 12c = 3c Solving -21 + 12c = 3c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3c' to each side of the equation. -21 + 12c + -3c = 3c + -3c Combine like terms: 12c + -3c = 9c -21 + 9c = 3c + -3c Combine like terms: 3c + -3c = 0 -21 + 9c = 0 Add '21' to each side of the equation. -21 + 21 + 9c = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 9c = 0 + 21 9c = 0 + 21 Combine like terms: 0 + 21 = 21 9c = 21 Divide each side by '9'. c = 2.333333333 Simplifying c = 2.333333333
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