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Simplifying 3x + 129 = 12x + -6 Reorder the terms: 129 + 3x = 12x + -6 Reorder the terms: 129 + 3x = -6 + 12x Solving 129 + 3x = -6 + 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 + 3x + -12x = -6 + 12x + -12x Combine like terms: 3x + -12x = -9x 129 + -9x = -6 + 12x + -12x Combine like terms: 12x + -12x = 0 129 + -9x = -6 + 0 129 + -9x = -6 Add '-129' to each side of the equation. 129 + -129 + -9x = -6 + -129 Combine like terms: 129 + -129 = 0 0 + -9x = -6 + -129 -9x = -6 + -129 Combine like terms: -6 + -129 = -135 -9x = -135 Divide each side by '-9'. x = 15 Simplifying x = 15
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