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Simplifying 2x + 3x + 21 = 21 Reorder the terms: 21 + 2x + 3x = 21 Combine like terms: 2x + 3x = 5x 21 + 5x = 21 Add '-21' to each side of the equation. 21 + -21 + 5x = 21 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = 21 + -21 5x = 21 + -21 Combine like terms: 21 + -21 = 0 5x = 0 Solving 5x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Divide each side by '5'. x = 0 Simplifying x = 0
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