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Simplifying 9 + 6x + 21 = 0 Reorder the terms: 9 + 21 + 6x = 0 Combine like terms: 9 + 21 = 30 30 + 6x = 0 Solving 30 + 6x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 6x = 0 + -30 Combine like terms: 30 + -30 = 0 0 + 6x = 0 + -30 6x = 0 + -30 Combine like terms: 0 + -30 = -30 6x = -30 Divide each side by '6'. x = -5 Simplifying x = -5
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