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j in (-oo:+oo)
(1/2)*j = 5/9 // - 5/9
(1/2)*j-(5/9) = 0
(1/2)*j-5/9 = 0
1/2*j-5/9 = 0 // + 5/9
1/2*j = 5/9 // : 1/2
j = 5/9/1/2
j = 10/9
j = 10/9
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