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=3-9 -17x+4x +35z+23y
= -6-13x +35z+23y
(3-17x+35z) +4x +23y -36 =
3 - 17x +35z +4x +23y - 36 =
3 - 36 - 17x + 4x +35z = -33 - 3x + 39 z