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Simplifying 9x + 12x + 20 = 0 Reorder the terms: 20 + 9x + 12x = 0 Combine like terms: 9x + 12x = 21x 20 + 21x = 0 Solving 20 + 21x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 21x = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 21x = 0 + -20 21x = 0 + -20 Combine like terms: 0 + -20 = -20 21x = -20 Divide each side by '21'. x = -0.9523809524 Simplifying x = -0.9523809524
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