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a+2 , a+4, a+6 , a+8 , a+10 kolejne liczby nieparzyste
a+a+2+a+4+a+6+a+8+a+10 =420
6a+30=420
6a=420 -30
a=390:6
a=65
65 67 69 71 73 75 szukane liczby