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Simplifying 3x + 21 = 21 + -5x Reorder the terms: 21 + 3x = 21 + -5x Add '-21' to each side of the equation. 21 + -21 + 3x = 21 + -21 + -5x Combine like terms: 21 + -21 = 0 0 + 3x = 21 + -21 + -5x 3x = 21 + -21 + -5x Combine like terms: 21 + -21 = 0 3x = 0 + -5x 3x = -5x Solving 3x = -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. 3x + 5x = -5x + 5x Combine like terms: 3x + 5x = 8x 8x = -5x + 5x Combine like terms: -5x + 5x = 0 8x = 0 Divide each side by '8'. x = 0 Simplifying x = 0
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