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j - pan Janek
z=j+2
3z=4j
z=j+2
3(j+2)=4j
z=j+2
3j+6=4j
z=j+2
4j-3j=6
z=j+2
j=6
z=6+2
j=6
z=8
j=6
Pani Zosia pracuje 8 h dziennie, a pan Janek - 6 h.