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x in (-oo:+oo)
(2/3)*(3*x+9) = 8*x // - 8*x
(2/3)*(3*x+9)-(8*x) = 0
(2/3)*(3*x+9)-8*x = 0
2/3*(3*x+9)-8*x = 0
2/3*(3*x+9)-8*x = 0
6-6*x = 0
6-6*x = 0
6-6*x = 0 // - 6
-6*x = -6 // : -6
x = -6/(-6)
x = 1
x = 1
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