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-x²-2x²+2x =
-3x²+2x =
-3*(-2)²+2*(-2) =
-3*4-4 =
-12-4 =
-16
-x2 - 2(x2 - x)=-(-2)-2(-2 *2 - (-2))=2-2(-4+2)=2+8-2=8