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Simplifying 81 = -3(1 + -4x) 81 = (1 * -3 + -4x * -3) 81 = (-3 + 12x) Solving 81 = -3 + 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 = -3 + 12x + -12x Combine like terms: 12x + -12x = 0 81 + -12x = -3 + 0 81 + -12x = -3 Add '-81' to each side of the equation. 81 + -81 + -12x = -3 + -81 Combine like terms: 81 + -81 = 0 0 + -12x = -3 + -81 -12x = -3 + -81 Combine like terms: -3 + -81 = -84 -12x = -84 Divide each side by '-12'. x = 7 Simplifying x = 7
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