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Simplifying 21 + c = 7 + 3c Solving 21 + c = 7 + 3c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-3c' to each side of the equation. 21 + c + -3c = 7 + 3c + -3c Combine like terms: c + -3c = -2c 21 + -2c = 7 + 3c + -3c Combine like terms: 3c + -3c = 0 21 + -2c = 7 + 0 21 + -2c = 7 Add '-21' to each side of the equation. 21 + -21 + -2c = 7 + -21 Combine like terms: 21 + -21 = 0 0 + -2c = 7 + -21 -2c = 7 + -21 Combine like terms: 7 + -21 = -14 -2c = -14 Divide each side by '-2'. c = 7 Simplifying c = 7
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