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x liczba
2/3x + 1/2x + 1/7x=55
28/42x+21/42x+6/42x=55
55/42x=55 //*42/55
x=42
spr 2/3*42+1/2*42+1/7*42=28+21+6=55
28/42x+21/42x+6/42x=55
55/42x=55 |/ 55/42
x=42
Odp.: To liczba 42.