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Simplifying 21 = -5w + 3(w + 3) Reorder the terms: 21 = -5w + 3(3 + w) 21 = -5w + (3 * 3 + w * 3) 21 = -5w + (9 + 3w) Reorder the terms: 21 = 9 + -5w + 3w Combine like terms: -5w + 3w = -2w 21 = 9 + -2w Solving 21 = 9 + -2w Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '2w' to each side of the equation. 21 + 2w = 9 + -2w + 2w Combine like terms: -2w + 2w = 0 21 + 2w = 9 + 0 21 + 2w = 9 Add '-21' to each side of the equation. 21 + -21 + 2w = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 2w = 9 + -21 2w = 9 + -21 Combine like terms: 9 + -21 = -12 2w = -12 Divide each side by '2'. w = -6 Simplifying w = -6
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