Given data:
The given expression is (2x+5y+z-6)+(6x-2y-z+7)+(-4x+y-3z-2).
The given expression can be written as,
(2x+5y+z-6)+(6x-2y-z+7)+(-4x+y-3z-2)=4x+4y-3z-1
Thus, the above expression can be written as 4x+4y-3z-1.
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