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Simplifying x + x + 30 = 120 Reorder the terms: 30 + x + x = 120 Combine like terms: x + x = 2x 30 + 2x = 120 Solving 30 + 2x = 120 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 2x = 120 + -30 Combine like terms: 30 + -30 = 0 0 + 2x = 120 + -30 2x = 120 + -30 Combine like terms: 120 + -30 = 90 2x = 90 Divide each side by '2'. x = 45 Simplifying x = 45
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