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