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x in (-oo:+oo)
(2/3)*(x+9) = x+5 // - x+5
(2/3)*(x+9)-x-5 = 0
2/3*(x+9)-x-5 = 0
2/3*(x+9)-x-5 = 0
6-1/3*x-5 = 0
1-1/3*x = 0
1-1/3*x = 0
1-1/3*x = 0 // - 1
-1/3*x = -1 // : -1/3
x = -1/(-1/3)
x = 3
x = 3
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