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x in (-oo:+oo)
(1/5)*x-9 = (4/5)*x-9 // - (4/5)*x-9
(1/5)*x-((4/5)*x)-9+9 = 0
(1/5)*x+(-4/5)*x-9+9 = 0
-3/5*x = 0 // : -3/5
x = 0
x = 0
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