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Determina numarul natural x pentru care 7x+14x+21x+28x+.....+126x=7•9•19

Răspuns :

Mergi din 7 in 7 pana la 126
7x+14x+21x+28x +35x+42x+49x+56x+63x+70x+77x +84x+91x+98x+ 105x+112x+119x+126x=1197
1197x=1197
x= 1197/1197=> x=1