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j in (-oo:+oo)
4/(-6)-3*j = 12 // - 12
4/(-6)-3*j-12 = 0
-3*j-38/3 = 0 // + 38/3
-3*j = 38/3 // : -3
j = 38/3/(-3)
j = -38/9
j = -38/9
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