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x in (-oo:+oo)
Y = (-3/4)*x-4 // - (-3/4)*x-4
Y-((-3/4)*x)+4 = 0
Y+(3/4)*x+4 = 0
Y+3/4*x+4 = 0 // - Y+4
3/4*x = -(Y+4) // : 3/4
x = (-(Y+4))/3/4
x = -4/3*(Y+4)
x = -4/3*(Y+4)
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