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x in (-oo:+oo)
y-1 = (-2/9)*x // - (-2/9)*x
y-((-2/9)*x)-1 = 0
(2/9)*x+y-1 = 0
2/9*x+y-1 = 0 // - y-1
2/9*x = -(y-1) // : 2/9
x = (-(y-1))/2/9
x = 9/2*(1-y)
x = 9/2*(1-y)
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