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Simplifying 2x + 9 + 4x = 81 Reorder the terms: 9 + 2x + 4x = 81 Combine like terms: 2x + 4x = 6x 9 + 6x = 81 Solving 9 + 6x = 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 + 6x = 81 + -9 Combine like terms: 9 + -9 = 0 0 + 6x = 81 + -9 6x = 81 + -9 Combine like terms: 81 + -9 = 72 6x = 72 Divide each side by '6'. x = 12 Simplifying x = 12
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