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Simplifying x + x + 21 = 51 Reorder the terms: 21 + x + x = 51 Combine like terms: x + x = 2x 21 + 2x = 51 Solving 21 + 2x = 51 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 2x = 51 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 51 + -21 2x = 51 + -21 Combine like terms: 51 + -21 = 30 2x = 30 Divide each side by '2'. x = 15 Simplifying x = 15
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