2a^2-3b^2= 12m^2-12n^2= ax^2-ay^2= 2a^2x-2b^2x= 5x^2-5= 2a^2-8= 3an^2-27a= 2xy^2-50x = x^3-9= 3y^3-3y= 2a^3-8a= 40b-10b^3=
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