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Simplifying x + 57 + x + 129 = 180 Reorder the terms: 57 + 129 + x + x = 180 Combine like terms: 57 + 129 = 186 186 + x + x = 180 Combine like terms: x + x = 2x 186 + 2x = 180 Solving 186 + 2x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-186' to each side of the equation. 186 + -186 + 2x = 180 + -186 Combine like terms: 186 + -186 = 0 0 + 2x = 180 + -186 2x = 180 + -186 Combine like terms: 180 + -186 = -6 2x = -6 Divide each side by '2'. x = -3 Simplifying x = -3
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