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x in (-oo:+oo)
y-1 = (1/2)*(x-4) // - (1/2)*(x-4)
y-((1/2)*(x-4))-1 = 0
(-1/2)*(x-4)+y-1 = 0
y-1/2*(x-4)-1 = 0
y-1/2*(x-4)-1 = 0
y-1/2*x-1+2 = 0
y-1/2*x+1 = 0
y-1/2*x+1 = 0
y-1/2*x+1 = 0 // - y+1
-1/2*x = -(y+1) // : -1/2
x = (-(y+1))/(-1/2)
x = 2*(y+1)
x = 2*(y+1)
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