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Simplifying x + x + 15 = 55 Reorder the terms: 15 + x + x = 55 Combine like terms: x + x = 2x 15 + 2x = 55 Solving 15 + 2x = 55 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 2x = 55 + -15 Combine like terms: 15 + -15 = 0 0 + 2x = 55 + -15 2x = 55 + -15 Combine like terms: 55 + -15 = 40 2x = 40 Divide each side by '2'. x = 20 Simplifying x = 20
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