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Simplifying -9x + 81 = 9x + -81 Reorder the terms: 81 + -9x = 9x + -81 Reorder the terms: 81 + -9x = -81 + 9x Solving 81 + -9x = -81 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 81 + -9x + -9x = -81 + 9x + -9x Combine like terms: -9x + -9x = -18x 81 + -18x = -81 + 9x + -9x Combine like terms: 9x + -9x = 0 81 + -18x = -81 + 0 81 + -18x = -81 Add '-81' to each side of the equation. 81 + -81 + -18x = -81 + -81 Combine like terms: 81 + -81 = 0 0 + -18x = -81 + -81 -18x = -81 + -81 Combine like terms: -81 + -81 = -162 -18x = -162 Divide each side by '-18'. x = 9 Simplifying x = 9
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