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x in (-oo:+oo)
8/9 = (4/5)*x // - (4/5)*x
8/9-((4/5)*x) = 0
(-4/5)*x+8/9 = 0
8/9-4/5*x = 0 // - 8/9
-4/5*x = -8/9 // : -4/5
x = -8/9/(-4/5)
x = 10/9
x = 10/9
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