a+b
b=c+d
а+b=a+(c+d)
a+b=a+(c+d)
a+b=(а+c)+d e=a+c
a+b=(a+c)+d
a+b=e+d
a+b=a+(c+d)=(a+c)+d=e+d.
c=ab=(ad)(bd)
c=ab=(ad)(bd)
c=ab=(a+d)(b+d)
c=ab=(a+d)(b+d)
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