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x in (-oo:+oo)
(x-(1/2))*(x+3/7) = 0
(x-1/2)*(x+3/7) = 0
( x+3/7 )
x+3/7 = 0 // - 3/7
x = -3/7
( x-1/2 )
x-1/2 = 0 // + 1/2
x = 1/2
x in { -3/7, 1/2 }
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