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

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

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

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

(3b-8)*(3b+8)=*2-

(3b-8)*(3b+8)=(*)2-

(12-m)*(12+m)=-2

(z-12)*(z+12)=2-

(12-cd)*(cd+12)=-()2

(8b-12)*(8b+12)=*2-

(8b-12)*(12+8b)=(*)2-

(3ab-zx)*(zx+3ab)=*()2-()2

(3z+a)*(a-3z)=2-*2

(mlu+3k)*(3k-mlu)=*2-()2

(12bc3-3x)*(3x+12bc3)=*b2c6-*2

(12bc3-3x)*(3x+12bc3)=(*bc3)2-*2



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