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x in (-oo:+oo)
y = (-8/9)*x+1 // - (-8/9)*x+1
y-((-8/9)*x)-1 = 0
(8/9)*x+y-1 = 0
8/9*x+y-1 = 0 // - y-1
8/9*x = -(y-1) // : 8/9
x = (-(y-1))/8/9
x = 9/8*(1-y)
x = 9/8*(1-y)
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