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x in (-oo:+oo)
5-((2*x)/3) = 9 // - 9
5-((2*x)/3)-9 = 0
(-2/3)*x-9+5 = 0
-2/3*x-4 = 0 // + 4
-2/3*x = 4 // : -2/3
x = 4/(-2/3)
x = -6
x = -6
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