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x in (-oo:+oo)
x*((x^2+10*x)/5) = 0
(x*(x^2+10*x))/5 = 0
x^2+10*x = 0
x*(x+10) = 0
x+10 = 0 // - 10
x = -10
x*(x+10) = 0
(x^2*(x+10))/5 = 0
( x+10 )
x+10 = 0 // - 10
x = -10
( x )
x = 0
x in { -10, 0, 0 }
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