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Simplifying -81 = -3(7 + 4x) -81 = (7 * -3 + 4x * -3) -81 = (-21 + -12x) Solving -81 = -21 + -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 = -21 + -12x + 12x Combine like terms: -12x + 12x = 0 -81 + 12x = -21 + 0 -81 + 12x = -21 Add '81' to each side of the equation. -81 + 81 + 12x = -21 + 81 Combine like terms: -81 + 81 = 0 0 + 12x = -21 + 81 12x = -21 + 81 Combine like terms: -21 + 81 = 60 12x = 60 Divide each side by '12'. x = 5 Simplifying x = 5
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