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Simplifying 3.5(1 + 8z) = 28.5 (1 * 3.5 + 8z * 3.5) = 28.5 (3.5 + 28z) = 28.5 Solving 3.5 + 28z = 28.5 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + 28z = 28.5 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + 28z = 28.5 + -3.5 28z = 28.5 + -3.5 Combine like terms: 28.5 + -3.5 = 25 28z = 25 Divide each side by '28'. z = 0.8928571429 Simplifying z = 0.8928571429
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