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x-(2y+(3z+x-x+y)-2x+y+3z)+6z
x-(2y+(3z+y)-2x+y+3z)+6z
x-(2y+3z+y-2x+y+3z)+6z
x-(4y+6z-2x)+6z
x-4y-6z+2x+6z
3x-4y