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Simplifying 9 + 11x = 129 + x Solving 9 + 11x = 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. 9 + 11x + -1x = 129 + x + -1x Combine like terms: 11x + -1x = 10x 9 + 10x = 129 + x + -1x Combine like terms: x + -1x = 0 9 + 10x = 129 + 0 9 + 10x = 129 Add '-9' to each side of the equation. 9 + -9 + 10x = 129 + -9 Combine like terms: 9 + -9 = 0 0 + 10x = 129 + -9 10x = 129 + -9 Combine like terms: 129 + -9 = 120 10x = 120 Divide each side by '10'. x = 12 Simplifying x = 12
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