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x in (-oo:+oo)
Y = (-3/8)*x-1 // - (-3/8)*x-1
Y-((-3/8)*x)+1 = 0
Y+(3/8)*x+1 = 0
Y+3/8*x+1 = 0 // - Y+1
3/8*x = -(Y+1) // : 3/8
x = (-(Y+1))/3/8
x = -8/3*(Y+1)
x = -8/3*(Y+1)
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