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x in (-oo:+oo)
Y = (-8/9)*x-8 // - (-8/9)*x-8
Y-((-8/9)*x)+8 = 0
Y+(8/9)*x+8 = 0
Y+8/9*x+8 = 0 // - Y+8
8/9*x = -(Y+8) // : 8/9
x = (-(Y+8))/8/9
x = -9/8*(Y+8)
x = -9/8*(Y+8)
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