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x in (-oo:+oo)
Y = (-1/9)*x-3 // - (-1/9)*x-3
Y-((-1/9)*x)+3 = 0
Y+(1/9)*x+3 = 0
Y+1/9*x+3 = 0 // - Y+3
1/9*x = -(Y+3) // : 1/9
x = (-(Y+3))/1/9
x = -9*(Y+3)
x = -9*(Y+3)
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