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Simplifying 3x + 9(3x + 9) = 0 Reorder the terms: 3x + 9(9 + 3x) = 0 3x + (9 * 9 + 3x * 9) = 0 3x + (81 + 27x) = 0 Reorder the terms: 81 + 3x + 27x = 0 Combine like terms: 3x + 27x = 30x 81 + 30x = 0 Solving 81 + 30x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-81' to each side of the equation. 81 + -81 + 30x = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 30x = 0 + -81 30x = 0 + -81 Combine like terms: 0 + -81 = -81 30x = -81 Divide each side by '30'. x = -2.7 Simplifying x = -2.7
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