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Simplifying -21x + x = x + 18 Combine like terms: -21x + x = -20x -20x = x + 18 Reorder the terms: -20x = 18 + x Solving -20x = 18 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -20x + -1x = 18 + x + -1x Combine like terms: -20x + -1x = -21x -21x = 18 + x + -1x Combine like terms: x + -1x = 0 -21x = 18 + 0 -21x = 18 Divide each side by '-21'. x = -0.8571428571 Simplifying x = -0.8571428571
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