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j in (-oo:+oo)
4-(j/2)-(3*j) = 0
4-(j/2)-3*j = 0
4-7/2*j = 0 // - 4
-7/2*j = -4 // : -7/2
j = -4/(-7/2)
j = 8/7
j = 8/7
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