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y-mianownik
(x+1):(y+1)=1/3
(x-1):(y-1)=1/4
3(x+1)=(y+1)
4(x-1)=(y-1)
3x+3=y+1
4x-4=y-1
3x-y=-2
-4x+y=-3
-x=-5
x=5
3*5-y=-2
-y=-17
y=17
x=5
y=17
ułamek to 5/17.