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Simplifying x + 21 + 2x = 0 + -2x + -4 Reorder the terms: 21 + x + 2x = 0 + -2x + -4 Combine like terms: x + 2x = 3x 21 + 3x = 0 + -2x + -4 Reorder the terms: 21 + 3x = 0 + -4 + -2x Combine like terms: 0 + -4 = -4 21 + 3x = -4 + -2x Solving 21 + 3x = -4 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 21 + 3x + 2x = -4 + -2x + 2x Combine like terms: 3x + 2x = 5x 21 + 5x = -4 + -2x + 2x Combine like terms: -2x + 2x = 0 21 + 5x = -4 + 0 21 + 5x = -4 Add '-21' to each side of the equation. 21 + -21 + 5x = -4 + -21 Combine like terms: 21 + -21 = 0 0 + 5x = -4 + -21 5x = -4 + -21 Combine like terms: -4 + -21 = -25 5x = -25 Divide each side by '5'. x = -5 Simplifying x = -5
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