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Simplifying 7x + 9 + 3x = 129 Reorder the terms: 9 + 7x + 3x = 129 Combine like terms: 7x + 3x = 10x 9 + 10x = 129 Solving 9 + 10x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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