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j in (-oo:+oo)
(-1/4)*j = 2/3 // - 2/3
(-1/4)*j-(2/3) = 0
(-1/4)*j-2/3 = 0
-1/4*j-2/3 = 0 // + 2/3
-1/4*j = 2/3 // : -1/4
j = 2/3/(-1/4)
j = -8/3
j = -8/3
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