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