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x
Kowalska
x+200
12x+12(x+200)=48 000
12x + 12x + 2400 = 48 000
24 x = 45 600
x = 1 900 -> kowalski
x + 200 -> 2 100 kowalska
x+200 - zarobki p.Kowalskiej
x*12+(x+200) *12=48 000
12x+12x+2400=48 000
12x + 12x= 48 000-2 400
24x=45 600 / :24
x= 1900
1900+200= 2100
2100- zarobki miesieczne p.Kowalskiej
1900- zarobki miesieczne p. Kowalskiego
12x + 12y = 48000/:12
x+y = 4000
2y + 200 = 4000
y = 1900
x = 2100