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j in (-oo:+oo)
j/(-4)+18/(-4) = 8 // - 8
j/(-4)+18/(-4)-8 = 0
-1/4*j-25/2 = 0 // + 25/2
-1/4*j = 25/2 // : -1/4
j = 25/2/(-1/4)
j = -50
j = -50
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