-x^8-(-x²)^4+[-(-x)²·x²]²=
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-x^8-(-x²)^4+[-(-x)²·x²]²=
-x^8-(-x²)^4+[-(-x)²·x²]²=
-x^8-(-x²)^4+[-(-x)²·x²]²=
-x^8-(-x²)^4+[-(-x)²·x²]²
=-x^8-x^8+[-x^2·x²]²
=-x^8-x^8+[-x^4]²
=-x^8-x^8+ x^8
=-x^8