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Simplifying x + x + 50 = 90 Reorder the terms: 50 + x + x = 90 Combine like terms: x + x = 2x 50 + 2x = 90 Solving 50 + 2x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -50 + 2x = 90 + -50 Combine like terms: 50 + -50 = 0 0 + 2x = 90 + -50 2x = 90 + -50 Combine like terms: 90 + -50 = 40 2x = 40 Divide each side by '2'. x = 20 Simplifying x = 20
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