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x in (-oo:+oo)
x/9 = (2*x)/3-5 // - (2*x)/3-5
x/9-((2*x)/3)+5 = 0
x/9+(-2/3)*x+5 = 0
5-5/9*x = 0 // - 5
-5/9*x = -5 // : -5/9
x = -5/(-5/9)
x = 9
x = 9
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