4 -x1   + 2x2  +     3x3               - x5  +  15x6 = 10 -2x1 -  3x2  +   13x3  -  3x4  -  2x5  -   4x6  =  2 -3x1  -   x2  +   16x3  -  3x4  +  2x5  -  9x6  =  -8

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