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x in (-oo:+oo)
y-1 = (1/2)*(x-2) // - (1/2)*(x-2)
y-((1/2)*(x-2))-1 = 0
(-1/2)*(x-2)+y-1 = 0
y-1/2*(x-2)-1 = 0
y-1/2*(x-2)-1 = 0
y-1/2*x-1+1 = 0
y-1/2*x = 0
y-1/2*x = 0
y-1/2*x = 0 // - y
-1/2*x = -y // : -1/2
x = -y/(-1/2)
x = 2*y
x = 2*y
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