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Simplifying x + 2x + -21 = 180 Reorder the terms: -21 + x + 2x = 180 Combine like terms: x + 2x = 3x -21 + 3x = 180 Solving -21 + 3x = 180 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 + 3x = 180 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 180 + 21 3x = 180 + 21 Combine like terms: 180 + 21 = 201 3x = 201 Divide each side by '3'. x = 67 Simplifying x = 67
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