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11+22+33+...+88-2x=x+12

Răspuns :

11+22+33+...+88-2x = x+12

11•(1+2+3+...+8) = 3x+12

11•36 = 3x+12

3x = 11•36 -12

x = 11•36/3 - 12/3

x = 132 - 4

x = 128