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x in (-oo:+oo)
y = (4/5)*x-9 // - (4/5)*x-9
y-((4/5)*x)+9 = 0
(-4/5)*x+y+9 = 0
y-4/5*x+9 = 0 // - y+9
-4/5*x = -(y+9) // : -4/5
x = (-(y+9))/(-4/5)
x = 5/4*(y+9)
x = 5/4*(y+9)
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