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Simplifying x + 2x + -81 = 9 Reorder the terms: -81 + x + 2x = 9 Combine like terms: x + 2x = 3x -81 + 3x = 9 Solving -81 + 3x = 9 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 + 3x = 9 + 81 Combine like terms: -81 + 81 = 0 0 + 3x = 9 + 81 3x = 9 + 81 Combine like terms: 9 + 81 = 90 3x = 90 Divide each side by '3'. x = 30 Simplifying x = 30
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