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y - pieniądze Jadzi
x+y=54
x-y=y+6
x=54-y
54-y-y=y+6
x=54-y
-y-y-y=6-54
x=54-y
-3y=-48 /:(-3)
x=54-y
y=16
x=54-16
y=16
x=28
y=16
Odp.Jadzia miała 16 zł, a Ewa 28 zł.