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x in (-oo:+oo)
(-1/3)*(x+2)*(x-1) = 0
-1/3*(x+2)*(x-1) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-1 )
x-1 = 0 // + 1
x = 1
x in { -2, 1 }
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