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