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