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Simplifying 4 + 2x + 21 = 0 Reorder the terms: 4 + 21 + 2x = 0 Combine like terms: 4 + 21 = 25 25 + 2x = 0 Solving 25 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + 2x = 0 + -25 Combine like terms: 25 + -25 = 0 0 + 2x = 0 + -25 2x = 0 + -25 Combine like terms: 0 + -25 = -25 2x = -25 Divide each side by '2'. x = -12.5 Simplifying x = -12.5
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