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de descompus in factorii :    21a-15b+30    ;    2(n+3)+2(n+3)+2(n+1)


Răspuns :

21a-15b+30=3(7a-5b+10)

2(n+3)+2(n+3)+2(n+1)=2(n+3+n+3+n+1)=2(3n+7)