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(-2+2+4+6+8+x)/6 = 5
(18+x)/6=5 /*6
18+x=30
x=30-18
x=12
Odp. Szukana liczba to 12.
5= (18+x) :6
5*6=18+x
30=18+x
x=30-18
x=12
x=30-18
x=12