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3 -17x +35z +4x +23y -9
-17x +4x +35z +23y +3 -9
-13x +35z +23y -6
2. (42n +35m +7) -(50m -20n +9)
42n +35m +7 -50m +20n -9
42n +20n +35m -50m +7 -9
62n -15m -2