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x in (-oo:+oo)
y+8 = (1/2)*(x-1) // - (1/2)*(x-1)
y-((1/2)*(x-1))+8 = 0
(-1/2)*(x-1)+y+8 = 0
y-1/2*(x-1)+8 = 0
y-1/2*(x-1)+8 = 0
y-1/2*x+1/2+8 = 0
y-1/2*x+17/2 = 0
y-1/2*x+17/2 = 0
y-1/2*x+17/2 = 0 // - y+17/2
-1/2*x = -(y+17/2) // : -1/2
x = (-(y+17/2))/(-1/2)
x = 2*(y+17/2)
x = 2*(y+17/2)
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