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x in (-oo:+oo)
Y-6 = (-4/9)*x // - (-4/9)*x
Y-((-4/9)*x)-6 = 0
Y+(4/9)*x-6 = 0
Y+4/9*x-6 = 0 // - Y-6
4/9*x = -(Y-6) // : 4/9
x = (-(Y-6))/4/9
x = 9/4*(6-Y)
x = 9/4*(6-Y)
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