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