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