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Simplifying x + -21x = x + 84 Combine like terms: x + -21x = -20x -20x = x + 84 Reorder the terms: -20x = 84 + x Solving -20x = 84 + 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 = 84 + x + -1x Combine like terms: -20x + -1x = -21x -21x = 84 + x + -1x Combine like terms: x + -1x = 0 -21x = 84 + 0 -21x = 84 Divide each side by '-21'. x = -4 Simplifying x = -4
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