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x-5 złotówki
40-x - 2 złowtówki
1+5x+2(40-x)=150
1+5x+80-2x=150
3x=-1-80+150
3x=69//:3
x=23
40-23=17
1-1zł
23-5 złotówki
17-2 złotówki