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Simplifying 2c + 21 = -4c + 39 Reorder the terms: 21 + 2c = -4c + 39 Reorder the terms: 21 + 2c = 39 + -4c Solving 21 + 2c = 39 + -4c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4c' to each side of the equation. 21 + 2c + 4c = 39 + -4c + 4c Combine like terms: 2c + 4c = 6c 21 + 6c = 39 + -4c + 4c Combine like terms: -4c + 4c = 0 21 + 6c = 39 + 0 21 + 6c = 39 Add '-21' to each side of the equation. 21 + -21 + 6c = 39 + -21 Combine like terms: 21 + -21 = 0 0 + 6c = 39 + -21 6c = 39 + -21 Combine like terms: 39 + -21 = 18 6c = 18 Divide each side by '6'. c = 3 Simplifying c = 3
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