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y- druga liczba
18%x+28%y=40
0,6y-0,1x=8/*1,8
0,18x+0,28y=40
-0,18x+1,08y=14,4
1,36y=54,4/:1,36
y=40
y=40
0,6y-0,1x=8
y=40
-0,1x= -16 /: (-0,1)
x=160