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x+0,07-duzy haczyk
6*x+8(x+0,07)=3.5
6*18x+0.56=3.5
17x=2,94/:14
x=0,21
0,21+0,07+0,28
Odp:maly haczyk kosztuje 0,21gr a duzy haczyk kosztuje 0,28gr