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Simplifying 81 = 3x + 3(-4x + 9) Reorder the terms: 81 = 3x + 3(9 + -4x) 81 = 3x + (9 * 3 + -4x * 3) 81 = 3x + (27 + -12x) Reorder the terms: 81 = 27 + 3x + -12x Combine like terms: 3x + -12x = -9x 81 = 27 + -9x Solving 81 = 27 + -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 = 27 + -9x + 9x Combine like terms: -9x + 9x = 0 81 + 9x = 27 + 0 81 + 9x = 27 Add '-81' to each side of the equation. 81 + -81 + 9x = 27 + -81 Combine like terms: 81 + -81 = 0 0 + 9x = 27 + -81 9x = 27 + -81 Combine like terms: 27 + -81 = -54 9x = -54 Divide each side by '9'. x = -6 Simplifying x = -6
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