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170 = a·6 + b·1 + c·0.225, 22.8 = a·1 + b·0.225 + c·0.055, 4.5475 = a·0.225 + b·0.055 + c·0.01421
170 = a·6 + b·1 + c·0.225, 22.8 = a·1 + b·0.225 + c·0.055, 4.5475 = a·0.225 + b·0.055 + c·0.01421
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