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x in (-oo:+oo)
y+12 = (4/5)*(x+6) // - (4/5)*(x+6)
y-((4/5)*(x+6))+12 = 0
(-4/5)*(x+6)+y+12 = 0
y-4/5*(x+6)+12 = 0
y-4/5*(x+6)+12 = 0
y-4/5*x-24/5+12 = 0
y-4/5*x+36/5 = 0
y-4/5*x+36/5 = 0
y-4/5*x+36/5 = 0 // - y+36/5
-4/5*x = -(y+36/5) // : -4/5
x = (-(y+36/5))/(-4/5)
x = 5/4*(y+36/5)
x = 5/4*(y+36/5)
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