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Simplifying 81 = 3x + -8x + -4x Combine like terms: 3x + -8x = -5x 81 = -5x + -4x Combine like terms: -5x + -4x = -9x 81 = -9x Solving 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 + 9x Combine like terms: -9x + 9x = 0 81 + 9x = 0 Add '-81' to each side of the equation. 81 + -81 + 9x = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 9x = 0 + -81 9x = 0 + -81 Combine like terms: 0 + -81 = -81 9x = -81 Divide each side by '9'. x = -9 Simplifying x = -9
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