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x +6y +6z=35 -x -5y -7z=-35 5x +29y +32z=178 -6x -39y +39z=-228
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seems like one too many equations
x +6y +6z=35=x=-6y+35-6z
-x -5y -7z=-35=x=-5y+35-7z
5x +29y +32z=178=x=-29y/5+178/5-32z/5
-6x -39y +39z=-228=x=13z/2+38-13y/2
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