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

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

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

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

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

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

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

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

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

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

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

(6ab-zx)*(zx+6ab)=*()2-()2

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

(mlu+6k)*(6k-mlu)=*2-()2

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

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



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