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Simplifying 81 = 3x + -3(5x + 13) Reorder the terms: 81 = 3x + -3(13 + 5x) 81 = 3x + (13 * -3 + 5x * -3) 81 = 3x + (-39 + -15x) Reorder the terms: 81 = -39 + 3x + -15x Combine like terms: 3x + -15x = -12x 81 = -39 + -12x Solving 81 = -39 + -12x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '12x' to each side of the equation. 81 + 12x = -39 + -12x + 12x Combine like terms: -12x + 12x = 0 81 + 12x = -39 + 0 81 + 12x = -39 Add '-81' to each side of the equation. 81 + -81 + 12x = -39 + -81 Combine like terms: 81 + -81 = 0 0 + 12x = -39 + -81 12x = -39 + -81 Combine like terms: -39 + -81 = -120 12x = -120 Divide each side by '12'. x = -10 Simplifying x = -10
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