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x in (-oo:+oo)
y-9 = (8/5)*(x-3) // - (8/5)*(x-3)
y-((8/5)*(x-3))-9 = 0
(-8/5)*(x-3)+y-9 = 0
y-8/5*(x-3)-9 = 0
y-8/5*(x-3)-9 = 0
y-8/5*x-9+24/5 = 0
y-8/5*x-21/5 = 0
y-8/5*x-21/5 = 0
y-8/5*x-21/5 = 0 // - y-21/5
-8/5*x = -(y-21/5) // : -8/5
x = (-(y-21/5))/(-8/5)
x = -5/8*(21/5-y)
x = -5/8*(21/5-y)
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