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