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4x+3y+6+2x-5y-2=
4x+2x+3y-5y+6-2=
6x - 2y + 4
= 4x + 3y + 6 + 2x - 5y -2
= 4x + 2x + 3y - 5y + 6-2
= 6x - 2y + 4