-(5a+4b)^2-2(5a-4b)(3a-2b)=-(25a^2+40ab+16b^2)-2(15a^2-22ab+8b^2)=-25a^2-40ab-16b^2-30a^2+44ab-16b^2=-55a^2+4ab-32b^2
-(5a+4b)^2-2(5a-4b)(3a-2b)
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