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