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x in (-oo:+oo)
y+8 = (4/5)*(x-3) // - (4/5)*(x-3)
y-((4/5)*(x-3))+8 = 0
(-4/5)*(x-3)+y+8 = 0
y-4/5*(x-3)+8 = 0
y-4/5*(x-3)+8 = 0
y-4/5*x+12/5+8 = 0
y-4/5*x+52/5 = 0
y-4/5*x+52/5 = 0
y-4/5*x+52/5 = 0 // - y+52/5
-4/5*x = -(y+52/5) // : -4/5
x = (-(y+52/5))/(-4/5)
x = 5/4*(y+52/5)
x = 5/4*(y+52/5)
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