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j in (-oo:+oo)
5*j-((3*j)/2)+4 = 0
(-3/2)*j+5*j+4 = 0
7/2*j+4 = 0 // - 4
7/2*j = -4 // : 7/2
j = -4/7/2
j = -8/7
j = -8/7
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