-2x+y-5-4y+6x=
=-2x+y-(5-4y)+6x=
=-2x+y-5+4y+6x=
=4x+5y-5
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-2x+y-5-4y+6x=
=-2x+y-(5-4y)+6x=
=-2x+y-5+4y+6x=
=4x+5y-5