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Simplifying c + -21 = 3c + 5 Reorder the terms: -21 + c = 3c + 5 Reorder the terms: -21 + c = 5 + 3c Solving -21 + c = 5 + 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 = 5 + 3c + -3c Combine like terms: c + -3c = -2c -21 + -2c = 5 + 3c + -3c Combine like terms: 3c + -3c = 0 -21 + -2c = 5 + 0 -21 + -2c = 5 Add '21' to each side of the equation. -21 + 21 + -2c = 5 + 21 Combine like terms: -21 + 21 = 0 0 + -2c = 5 + 21 -2c = 5 + 21 Combine like terms: 5 + 21 = 26 -2c = 26 Divide each side by '-2'. c = -13 Simplifying c = -13
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