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Simplifying 20x + 129 = 12x + 81 Reorder the terms: 129 + 20x = 12x + 81 Reorder the terms: 129 + 20x = 81 + 12x Solving 129 + 20x = 81 + 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. 129 + 20x + -12x = 81 + 12x + -12x Combine like terms: 20x + -12x = 8x 129 + 8x = 81 + 12x + -12x Combine like terms: 12x + -12x = 0 129 + 8x = 81 + 0 129 + 8x = 81 Add '-129' to each side of the equation. 129 + -129 + 8x = 81 + -129 Combine like terms: 129 + -129 = 0 0 + 8x = 81 + -129 8x = 81 + -129 Combine like terms: 81 + -129 = -48 8x = -48 Divide each side by '8'. x = -6 Simplifying x = -6
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