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Simplifying 7x + -5 + 8 = 129 Reorder the terms: -5 + 8 + 7x = 129 Combine like terms: -5 + 8 = 3 3 + 7x = 129 Solving 3 + 7x = 129 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 7x = 129 + -3 Combine like terms: 3 + -3 = 0 0 + 7x = 129 + -3 7x = 129 + -3 Combine like terms: 129 + -3 = 126 7x = 126 Divide each side by '7'. x = 18 Simplifying x = 18
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