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(2x+4y+2-7)+(8×-2y-2+8)+(-4x+y-3z-2)=

User Stathis
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(2x+4y+2-7)+(8x-2y-2+8)+(-4x+y-3z-2) \\ 2x+4y-5+8x-2y+6-4x+y-3z-2 \\ 2x+8x-4x+4y-2y+y-3z-5+6-2 \\ 6x+3y-3z-1
User ChviLadislav
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