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(-1,0),(1,0),
b)
xy-y+x+1=0
y(x-1)=-x-1
y=-x-1/x-1
(0,1),(-1,0)
,(2,-3),(3,-2)
c)
xy-2y+x-5=0
y(x-2)=5-x
y=5-x/x-2
(1,-4),(-1,-2),(3,2),(5,0)