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x in (-oo:+oo)
Y = (-3/4)*x-9 // - (-3/4)*x-9
Y-((-3/4)*x)+9 = 0
Y+(3/4)*x+9 = 0
Y+3/4*x+9 = 0 // - Y+9
3/4*x = -(Y+9) // : 3/4
x = (-(Y+9))/3/4
x = -4/3*(Y+9)
x = -4/3*(Y+9)
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