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Simplifying (100 + 20) * 4z = 0 Combine like terms: 100 + 20 = 120 (120) * 4z = 0 Multiply 120 * 4 480z = 0 Solving 480z = 0 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Divide each side by '480'. z = 0.0 Simplifying z = 0.0
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