a2-b2=(a-b)(a+b)

(8-x)*(8+x)=-2

(a-8)*(a+8)=2-

(8-cd)*(8+cd)=-()2

(2b-8)*(2b+8)=*2-

(2b-8)*(2b+8)=(*)2-

(6-m)*(6+m)=-2

(z-6)*(z+6)=2-

(6-cd)*(cd+6)=-()2

(8b-6)*(8b+6)=*2-

(8b-6)*(6+8b)=(*)2-

(2ab-zx)*(zx+2ab)=*()2-()2

(2z+a)*(a-2z)=2-*2

(mlu+2k)*(2k-mlu)=*2-()2

(6bc3-2x)*(2x+6bc3)=*b2c6-*2

(6bc3-2x)*(2x+6bc3)=(*bc3)2-*2



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