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x in (-oo:+oo)
((x-3)/2)*((x-5)/(-2))*((x-7)/(-4)) = 0
((x-3)*(x-5)*(x-7))/(-4*(-2)*2) = 0
( x-3 )
x-3 = 0 // + 3
x = 3
( x-5 )
x-5 = 0 // + 5
x = 5
( x-7 )
x-7 = 0 // + 7
x = 7
x in { 3, 5, 7 }
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