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a^2-ab-ax+ax-bx-x^2-ab+b^2+bx=a^2b^2+a^2x-b^2x-x^2
a^2-a^2b^2-x^2+b^2=a^2b^2+a^2x-b^2x-x^2
-a^2 b^2-a^2b^2-x^2+x^2+b^2=a^2x-b^2x
-a^4b^4+b^2=a^2x-b^2x