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x in (-oo:+oo)
((6*(x+7))/17)*(x-4) = 0
(6*(x+7)*(x-4))/17 = 0
( x+7 )
x+7 = 0 // - 7
x = -7
( x-4 )
x-4 = 0 // + 4
x = 4
x in { -7, 4 }
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