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klasa Ib - y
x+y=67
0,6x+0,75y=45
x=67-y
0,6(67-y)+0,75y=45
x=67-y
40,2-0,6y+0,75y=45
x=67-y
0,15y=4,8 |:0,15
x=67-y
y=32
x=35