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x in (-oo:+oo)
(2/3)*x+5 = x+9 // - x+9
(2/3)*x-x-9+5 = 0
-1/3*x-4 = 0 // + 4
-1/3*x = 4 // : -1/3
x = 4/(-1/3)
x = -12
x = -12
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