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