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


Răspuns :

7x+14x+21x+28x +35x+42x+49x+56x+63x+70x+77x +84x+91x+98x+ 105x+112x+119x+126x=1197
1197x=1197
x=1