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j in (-oo:+oo)
9 = (6*j)/4 // - (6*j)/4
9-((6*j)/4) = 0
(-3/2)*j+9 = 0
9-3/2*j = 0 // - 9
-3/2*j = -9 // : -3/2
j = -9/(-3/2)
j = 6
j = 6
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