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x in (-oo:+oo)
y = (5/4)*x-20 // - (5/4)*x-20
y-((5/4)*x)+20 = 0
(-5/4)*x+y+20 = 0
y-5/4*x+20 = 0 // - y+20
-5/4*x = -(y+20) // : -5/4
x = (-(y+20))/(-5/4)
x = 4/5*(y+20)
x = 4/5*(y+20)
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