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X+3x+5x+...+13x=-490 x€Z


Răspuns :

x(1+3+5+7+9+11+13)=-490
49x=-490
x=-490:49
x=-10
x+3x+5x+7x+9x+11x+13x = -490
x(1+3+5+7+9+11+13) = -490
49x = -490
x = -490÷49
x = -10