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Simplifying (b + 12) * 2 = 81 Reorder the terms: (12 + b) * 2 = 81 Reorder the terms for easier multiplication: 2(12 + b) = 81 (12 * 2 + b * 2) = 81 (24 + 2b) = 81 Solving 24 + 2b = 81 Solving for variable 'b'. Move all terms containing b to the left, all other terms to the right. Add '-24' to each side of the equation. 24 + -24 + 2b = 81 + -24 Combine like terms: 24 + -24 = 0 0 + 2b = 81 + -24 2b = 81 + -24 Combine like terms: 81 + -24 = 57 2b = 57 Divide each side by '2'. b = 28.5 Simplifying b = 28.5
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