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x in (-oo:+oo)
y = (5/4)*x-(13/pi) // - (5/4)*x-(13/pi)
y-((5/4)*x)+13/pi = 0
(-5/4)*x+y+13/pi = 0
y-5/4*x+13/pi = 0 // - y+13/pi
-5/4*x = -(y+13/pi) // : -5/4
x = (-(y+13/pi))/(-5/4)
x = 4/5*(y+13/pi)
x = 4/5*(y+13/pi)
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