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j in (-oo:+oo)
(4*4)/2 = (9-7)*j // - (9-7)*j
(4*4)/2-((9-7)*j) = 0
8-2*j = 0 // - 8
-2*j = -8 // : -2
j = -8/(-2)
j = 4
j = 4
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