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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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