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Simplifying 2x + (x + 81) = 0 Reorder the terms: 2x + (81 + x) = 0 Remove parenthesis around (81 + x) 2x + 81 + x = 0 Reorder the terms: 81 + 2x + x = 0 Combine like terms: 2x + x = 3x 81 + 3x = 0 Solving 81 + 3x = 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 + 3x = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 3x = 0 + -81 3x = 0 + -81 Combine like terms: 0 + -81 = -81 3x = -81 Divide each side by '3'. x = -27 Simplifying x = -27
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