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Simplifying 30 + 2x + -9 = 0 Reorder the terms: 30 + -9 + 2x = 0 Combine like terms: 30 + -9 = 21 21 + 2x = 0 Solving 21 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 2x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = 0 + -21 2x = 0 + -21 Combine like terms: 0 + -21 = -21 2x = -21 Divide each side by '2'. x = -10.5 Simplifying x = -10.5
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