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Simplifying 4x + 81 = 9x + -9 Reorder the terms: 81 + 4x = 9x + -9 Reorder the terms: 81 + 4x = -9 + 9x Solving 81 + 4x = -9 + 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 + 4x + -9x = -9 + 9x + -9x Combine like terms: 4x + -9x = -5x 81 + -5x = -9 + 9x + -9x Combine like terms: 9x + -9x = 0 81 + -5x = -9 + 0 81 + -5x = -9 Add '-81' to each side of the equation. 81 + -81 + -5x = -9 + -81 Combine like terms: 81 + -81 = 0 0 + -5x = -9 + -81 -5x = -9 + -81 Combine like terms: -9 + -81 = -90 -5x = -90 Divide each side by '-5'. x = 18 Simplifying x = 18
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