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solve 0x-3.5y+4.3z=30, 3.5x+0*y+0.8z=16.5, 4.3x-0.8y+0*z=28.5
solve 0x-3.5y+4.3z=30, 3.5x+0*y+0.8z=16.5, 4.3x-0.8y+0*z=28.5
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