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x in (-oo:+oo)
Y = (-7/5)*x-(3/5) // - (-7/5)*x-(3/5)
Y-((-7/5)*x)+3/5 = 0
Y+(7/5)*x+3/5 = 0
Y+7/5*x+3/5 = 0 // - Y+3/5
7/5*x = -(Y+3/5) // : 7/5
x = (-(Y+3/5))/7/5
x = -5/7*(Y+3/5)
x = -5/7*(Y+3/5)
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