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Simplifying 8 + 12x = 129 + x Solving 8 + 12x = 129 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 8 + 12x + -1x = 129 + x + -1x Combine like terms: 12x + -1x = 11x 8 + 11x = 129 + x + -1x Combine like terms: x + -1x = 0 8 + 11x = 129 + 0 8 + 11x = 129 Add '-8' to each side of the equation. 8 + -8 + 11x = 129 + -8 Combine like terms: 8 + -8 = 0 0 + 11x = 129 + -8 11x = 129 + -8 Combine like terms: 129 + -8 = 121 11x = 121 Divide each side by '11'. x = 11 Simplifying x = 11
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