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