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y-pieniądze Pawła
y+30=x-30
5(y-30)=x+30
y+30=x-30
5y-150=x+30
-y-30=-x+30
5y-150=x+30
4y-180=60
4y=240
y=60
x=y+60=120
y-pieniądze Kuby
x + 30 = y - 30
5(x - 30) = y + 30
y = x + 60
5x - 150 = x + 60 + 30
y = x + 60
4x = 240
x = 60
y = 120
Odp.: Paweł ma 60zł, Kuba 120zł.