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x in (-oo:+oo)
Y = (-7/2)*x-4 // - (-7/2)*x-4
Y-((-7/2)*x)+4 = 0
Y+(7/2)*x+4 = 0
Y+7/2*x+4 = 0 // - Y+4
7/2*x = -(Y+4) // : 7/2
x = (-(Y+4))/7/2
x = -2/7*(Y+4)
x = -2/7*(Y+4)
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