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Simplifying (x + 9) * 2 = 81 Reorder the terms: (9 + x) * 2 = 81 Reorder the terms for easier multiplication: 2(9 + x) = 81 (9 * 2 + x * 2) = 81 (18 + 2x) = 81 Solving 18 + 2x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 2x = 81 + -18 Combine like terms: 18 + -18 = 0 0 + 2x = 81 + -18 2x = 81 + -18 Combine like terms: 81 + -18 = 63 2x = 63 Divide each side by '2'. x = 31.5 Simplifying x = 31.5
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