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Simplifying 13 + 7c + -4c + 8 = 0 Reorder the terms: 13 + 8 + 7c + -4c = 0 Combine like terms: 13 + 8 = 21 21 + 7c + -4c = 0 Combine like terms: 7c + -4c = 3c 21 + 3c = 0 Solving 21 + 3c = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3c = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 3c = 0 + -21 3c = 0 + -21 Combine like terms: 0 + -21 = -21 3c = -21 Divide each side by '3'. c = -7 Simplifying c = -7
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