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(x-1)/(y-1)=¼ /*(y-1)
x+1=⅓(y+1) /*3
x-1=¼(y-1) /*4
3x+3=y+1
4x-4=y-1
3x-y=1-3 /*(-1)
4x-y=-1+4
-3x+y=2
4x-y=3
----------------------
x=5
y=2+3x
y=2+3*5=2+15=17
Własność tą ma ułamek ⁵/₁₇