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x in (-oo:+oo)
(2/3)*x+9 = x+1 // - x+1
(2/3)*x-x-1+9 = 0
8-1/3*x = 0 // - 8
-1/3*x = -8 // : -1/3
x = -8/(-1/3)
x = 24
x = 24
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