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Simplifying 9c + 12c + 9 = -12 Reorder the terms: 9 + 9c + 12c = -12 Combine like terms: 9c + 12c = 21c 9 + 21c = -12 Solving 9 + 21c = -12 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 21c = -12 + -9 Combine like terms: 9 + -9 = 0 0 + 21c = -12 + -9 21c = -12 + -9 Combine like terms: -12 + -9 = -21 21c = -21 Divide each side by '21'. c = -1 Simplifying c = -1
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