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2+6x-4(-1)=6-2
2+ 6x - 4+4= 6-2
2-4+2-6x = 6-4
-6x=2/(-6)
x=
2x²+6x-4(x²+x-x-1)=6-2x²
2x²+6x-4x²-4x+4x+4=6-2x²
2x²-4x²+2x²+6x-4x+4x=6-4
6x=2/:6
x=2/6=1/3