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Simplifying 81 = 3(w + 7) Reorder the terms: 81 = 3(7 + w) 81 = (7 * 3 + w * 3) 81 = (21 + 3w) Solving 81 = 21 + 3w Solving for variable 'w'. Move all terms containing w to the left, all other terms to the right. Add '-3w' to each side of the equation. 81 + -3w = 21 + 3w + -3w Combine like terms: 3w + -3w = 0 81 + -3w = 21 + 0 81 + -3w = 21 Add '-81' to each side of the equation. 81 + -81 + -3w = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -3w = 21 + -81 -3w = 21 + -81 Combine like terms: 21 + -81 = -60 -3w = -60 Divide each side by '-3'. w = 20 Simplifying w = 20
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