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x in (-oo:+oo)
y = (1/6)*x-(1/9) // - (1/6)*x-(1/9)
y-((1/6)*x)+1/9 = 0
(-1/6)*x+y+1/9 = 0
y-1/6*x+1/9 = 0 // - y+1/9
-1/6*x = -(y+1/9) // : -1/6
x = (-(y+1/9))/(-1/6)
x = 6*(y+1/9)
x = 6*(y+1/9)
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