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= -2y - x + 2x - y + 6 - 2y + 5y - 2x =
= -2y + x - 3y + 6 + 5y - 2x = -5y + x + 6 + 5y - 2x =
= -x + 6
=-2y-x+2x-3y+6+10y-2x=
=5y-x+6