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x in (-oo:+oo)
Y-3 = (-5/8)*x // - (-5/8)*x
Y-((-5/8)*x)-3 = 0
Y+(5/8)*x-3 = 0
Y+5/8*x-3 = 0 // - Y-3
5/8*x = -(Y-3) // : 5/8
x = (-(Y-3))/5/8
x = 8/5*(3-Y)
x = 8/5*(3-Y)
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