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Simplifying 9z + 12z + 3 = 0 Reorder the terms: 3 + 9z + 12z = 0 Combine like terms: 9z + 12z = 21z 3 + 21z = 0 Solving 3 + 21z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 21z = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 21z = 0 + -3 21z = 0 + -3 Combine like terms: 0 + -3 = -3 21z = -3 Divide each side by '21'. z = -0.1428571429 Simplifying z = -0.1428571429
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