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x in (-oo:+oo)
(x-3)*(x+2/7) = 0
( x+2/7 )
x+2/7 = 0 // - 2/7
x = -2/7
( x-3 )
x-3 = 0 // + 3
x = 3
x in { -2/7, 3 }
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