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j in (-oo:+oo)
j/3 = 4.5 // - 4.5
j/3-4.5 = 0
1/3*j-4.5 = 0 // + 4.5
1/3*j = 4.5 // : 1/3
j = 4.5/1/3
j = 13.50000014
j = 13.50000014
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