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Simplifying (3x + 9) + (5x) = 81 Reorder the terms: (9 + 3x) + (5x) = 81 Remove parenthesis around (9 + 3x) 9 + 3x + (5x) = 81 Combine like terms: 3x + (5x) = 8x 9 + 8x = 81 Solving 9 + 8x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 8x = 81 + -9 Combine like terms: 9 + -9 = 0 0 + 8x = 81 + -9 8x = 81 + -9 Combine like terms: 81 + -9 = 72 8x = 72 Divide each side by '8'. x = 9 Simplifying x = 9
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