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x in (-oo:+oo)
Y = (-2/3)*x-b // - (-2/3)*x-b
Y+b-((-2/3)*x) = 0
Y+b+(2/3)*x = 0
Y+b+2/3*x = 0 // - Y+b
2/3*x = -(Y+b) // : 2/3
x = (-(Y+b))/2/3
x = -3/2*(Y+b)
x = -3/2*(Y+b)
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