0,5(40-tk)=1,5(tk-40)
20-0,5tk=1,5tk-60
-0,5tk-1,5tk=-60-20
-2tk=-80
tk=40
licze na naj
2tk=80
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20-0,5tk=1,5tk-60
-0,5tk-1,5tk=-60-20
-2tk=-80
tk=40
licze na naj
0,5(40-tk)=1,5(tk-40)
20-0,5tk=1,5tk-60
2tk=80
tk=40