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J in (-oo:+oo)
J*((5-(10*J))/4) = 0
J*((5-10*J)/4) = 0
(J*(5-10*J))/4 = 0
( 5-10*J )
5-10*J = 0 // - 5
-10*J = -5 // : -10
J = -5/(-10)
J = 1/2
( J )
J = 0
J in { 1/2, 0 }
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