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x in (-oo:+oo)
(x+4/3)*(x-(7/3)) = 0
(x+4/3)*(x-7/3) = 0
( x+4/3 )
x+4/3 = 0 // - 4/3
x = -4/3
( x-7/3 )
x-7/3 = 0 // + 7/3
x = 7/3
x in { -4/3, 7/3 }
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