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Simplifying 6.4z + 2.1(z + -2) = 8.5 Reorder the terms: 6.4z + 2.1(-2 + z) = 8.5 6.4z + (-2 * 2.1 + z * 2.1) = 8.5 6.4z + (-4.2 + 2.1z) = 8.5 Reorder the terms: -4.2 + 6.4z + 2.1z = 8.5 Combine like terms: 6.4z + 2.1z = 8.5z -4.2 + 8.5z = 8.5 Solving -4.2 + 8.5z = 8.5 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '4.2' to each side of the equation. -4.2 + 4.2 + 8.5z = 8.5 + 4.2 Combine like terms: -4.2 + 4.2 = 0.0 0.0 + 8.5z = 8.5 + 4.2 8.5z = 8.5 + 4.2 Combine like terms: 8.5 + 4.2 = 12.7 8.5z = 12.7 Divide each side by '8.5'. z = 1.494117647 Simplifying z = 1.494117647
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