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x+2/3x=y+25%y
x=y-20
1i2/3x=1,25y
1i2/3(y-20)=1,25y
1i2/3y-100/3=1,25y
1i8/12y-1i3/12y=100/3
5/12y=100/3 /*12/5
y=80
x=80-20
x=60