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x+1/4x=y-1/4y
x=28,80-y
1,25x=0,75y
1,25(28,80-y)=0,75y
36-1,25y=0,75y
0,75y+1,25y=36
2y=36
y=18
x+18=28,8
x=28,8-18
x=10,8