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Simplifying 28 = 21 + -2c Solving 28 = 21 + -2c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '2c' to each side of the equation. 28 + 2c = 21 + -2c + 2c Combine like terms: -2c + 2c = 0 28 + 2c = 21 + 0 28 + 2c = 21 Add '-28' to each side of the equation. 28 + -28 + 2c = 21 + -28 Combine like terms: 28 + -28 = 0 0 + 2c = 21 + -28 2c = 21 + -28 Combine like terms: 21 + -28 = -7 2c = -7 Divide each side by '2'. c = -3.5 Simplifying c = -3.5
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