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PP29
PP30.
PP50.
x- cena zeszytu y- cena długopisu
x=
3()+ 3y =24,60
31,5 - 4y = 3y =24,6
y=6,9
3x+4(6,9) = 31,5
3x +27,6 = 31,50
3x= 3,9
x= 1,3