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x in (-oo:+oo)
Y = (-6/5)*x-4 // - (-6/5)*x-4
Y-((-6/5)*x)+4 = 0
Y+(6/5)*x+4 = 0
Y+6/5*x+4 = 0 // - Y+4
6/5*x = -(Y+4) // : 6/5
x = (-(Y+4))/6/5
x = -5/6*(Y+4)
x = -5/6*(Y+4)
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