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x in (-oo:+oo)
(7*x-23)*(3/5-(5*x)) = 0
(7*x-23)*(3/5-5*x) = 0
( 3/5-5*x )
3/5-5*x = 0 // - 3/5
-5*x = -3/5 // : -5
x = -3/5/(-5)
x = 3/25
( 7*x-23 )
7*x-23 = 0 // + 23
7*x = 23 // : 7
x = 23/7
x in { 3/25, 23/7 }
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