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Simplifying 21 = 2c + -7 + -6c Reorder the terms: 21 = -7 + 2c + -6c Combine like terms: 2c + -6c = -4c 21 = -7 + -4c Solving 21 = -7 + -4c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4c' to each side of the equation. 21 + 4c = -7 + -4c + 4c Combine like terms: -4c + 4c = 0 21 + 4c = -7 + 0 21 + 4c = -7 Add '-21' to each side of the equation. 21 + -21 + 4c = -7 + -21 Combine like terms: 21 + -21 = 0 0 + 4c = -7 + -21 4c = -7 + -21 Combine like terms: -7 + -21 = -28 4c = -28 Divide each side by '4'. c = -7 Simplifying c = -7
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