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x in (-oo:+oo)
(4*x^2+28*x)/24 = 0
4*x^2+28*x = 0
4*x*(x+7) = 0
x+7 = 0 // - 7
x = -7
4*x*(x+7) = 0
(4*x*(x+7))/24 = 0
( 4*x )
4*x = 0 // : 4
x = 0
( x+7 )
x+7 = 0 // - 7
x = -7
x in { 0, -7 }
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