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Simplifying 81 = 3x + -3(3x + -9) Reorder the terms: 81 = 3x + -3(-9 + 3x) 81 = 3x + (-9 * -3 + 3x * -3) 81 = 3x + (27 + -9x) Reorder the terms: 81 = 27 + 3x + -9x Combine like terms: 3x + -9x = -6x 81 = 27 + -6x Solving 81 = 27 + -6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6x' to each side of the equation. 81 + 6x = 27 + -6x + 6x Combine like terms: -6x + 6x = 0 81 + 6x = 27 + 0 81 + 6x = 27 Add '-81' to each side of the equation. 81 + -81 + 6x = 27 + -81 Combine like terms: 81 + -81 = 0 0 + 6x = 27 + -81 6x = 27 + -81 Combine like terms: 27 + -81 = -54 6x = -54 Divide each side by '6'. x = -9 Simplifying x = -9
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