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Simplifying 21 = 3c + -3(6 + -2c) 21 = 3c + (6 * -3 + -2c * -3) 21 = 3c + (-18 + 6c) Reorder the terms: 21 = -18 + 3c + 6c Combine like terms: 3c + 6c = 9c 21 = -18 + 9c Solving 21 = -18 + 9c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-9c' to each side of the equation. 21 + -9c = -18 + 9c + -9c Combine like terms: 9c + -9c = 0 21 + -9c = -18 + 0 21 + -9c = -18 Add '-21' to each side of the equation. 21 + -21 + -9c = -18 + -21 Combine like terms: 21 + -21 = 0 0 + -9c = -18 + -21 -9c = -18 + -21 Combine like terms: -18 + -21 = -39 -9c = -39 Divide each side by '-9'. c = 4.333333333 Simplifying c = 4.333333333
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