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Simplifying 7[c + -12] = -21 Reorder the terms: 7[-12 + c] = -21 [-12 * 7 + c * 7] = -21 [-84 + 7c] = -21 Solving -84 + 7c = -21 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + 7c = -21 + 84 Combine like terms: -84 + 84 = 0 0 + 7c = -21 + 84 7c = -21 + 84 Combine like terms: -21 + 84 = 63 7c = 63 Divide each side by '7'. c = 9 Simplifying c = 9
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