x - zarobek Janka
0,4x+0,26x+0,12x+221,1=x
0,78x+221,1=x
x-0,78x=221,1
0,22x=221,1 |:0,22
x=1005zł
Janek zarobił 1005 zl.
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x - zarobek Janka
0,4x+0,26x+0,12x+221,1=x
0,78x+221,1=x
x-0,78x=221,1
0,22x=221,1 |:0,22
x=1005zł
Janek zarobił 1005 zl.