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x in (-oo:+oo)
y = (5/6)*(x-9-1) // - (5/6)*(x-9-1)
y-((5/6)*(x-9-1)) = 0
(-5/6)*(x-9-1)+y = 0
y-5/6*(x-10) = 0
y-5/6*(x-10) = 0
y-5/6*x+25/3 = 0
y-5/6*x+25/3 = 0
y-5/6*x+25/3 = 0 // - y+25/3
-5/6*x = -(y+25/3) // : -5/6
x = (-(y+25/3))/(-5/6)
x = 6/5*(y+25/3)
x = 6/5*(y+25/3)
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