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Simplifying x + x + -21 = 85 Reorder the terms: -21 + x + x = 85 Combine like terms: x + x = 2x -21 + 2x = 85 Solving -21 + 2x = 85 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 = 85 + 21 Combine like terms: -21 + 21 = 0 0 + 2x = 85 + 21 2x = 85 + 21 Combine like terms: 85 + 21 = 106 2x = 106 Divide each side by '2'. x = 53 Simplifying x = 53
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