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Simplifying 81 + -2x = 4x + 9 Reorder the terms: 81 + -2x = 9 + 4x Solving 81 + -2x = 9 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 81 + -2x + -4x = 9 + 4x + -4x Combine like terms: -2x + -4x = -6x 81 + -6x = 9 + 4x + -4x Combine like terms: 4x + -4x = 0 81 + -6x = 9 + 0 81 + -6x = 9 Add '-81' to each side of the equation. 81 + -81 + -6x = 9 + -81 Combine like terms: 81 + -81 = 0 0 + -6x = 9 + -81 -6x = 9 + -81 Combine like terms: 9 + -81 = -72 -6x = -72 Divide each side by '-6'. x = 12 Simplifying x = 12
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