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Simplifying 21 = -2(9c + 7) Reorder the terms: 21 = -2(7 + 9c) 21 = (7 * -2 + 9c * -2) 21 = (-14 + -18c) Solving 21 = -14 + -18c Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '18c' to each side of the equation. 21 + 18c = -14 + -18c + 18c Combine like terms: -18c + 18c = 0 21 + 18c = -14 + 0 21 + 18c = -14 Add '-21' to each side of the equation. 21 + -21 + 18c = -14 + -21 Combine like terms: 21 + -21 = 0 0 + 18c = -14 + -21 18c = -14 + -21 Combine like terms: -14 + -21 = -35 18c = -35 Divide each side by '18'. c = -1.944444444 Simplifying c = -1.944444444
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