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Simplifying x + x + 90 = 180 Reorder the terms: 90 + x + x = 180 Combine like terms: x + x = 2x 90 + 2x = 180 Solving 90 + 2x = 180 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + 2x = 180 + -90 Combine like terms: 90 + -90 = 0 0 + 2x = 180 + -90 2x = 180 + -90 Combine like terms: 180 + -90 = 90 2x = 90 Divide each side by '2'. x = 45 Simplifying x = 45
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