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y- banknoty 10zł
x+y=9
100y+10x+90=100x+10y
x+y=9 | *90
-90x+90y=-90
90x+90y=810
-90x-90y=-90
180y=720 |:180
y=5
x+5=9 |-5
x=4
x=4
y=5
4*100zł+5*10zł=450zł
Osp. Marek ma 450zł.