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Simplifying 21c + 9 = 15c + 3 Reorder the terms: 9 + 21c = 15c + 3 Reorder the terms: 9 + 21c = 3 + 15c Solving 9 + 21c = 3 + 15c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-15c' to each side of the equation. 9 + 21c + -15c = 3 + 15c + -15c Combine like terms: 21c + -15c = 6c 9 + 6c = 3 + 15c + -15c Combine like terms: 15c + -15c = 0 9 + 6c = 3 + 0 9 + 6c = 3 Add '-9' to each side of the equation. 9 + -9 + 6c = 3 + -9 Combine like terms: 9 + -9 = 0 0 + 6c = 3 + -9 6c = 3 + -9 Combine like terms: 3 + -9 = -6 6c = -6 Divide each side by '6'. c = -1 Simplifying c = -1
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