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