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j in (-oo:+oo)
((1^2)/3)*j = 15 // - 15
((1^2)/3)*j-15 = 0
(1/3)*j-15 = 0
1/3*j-15 = 0 // + 15
1/3*j = 15 // : 1/3
j = 15/1/3
j = 45
j = 45
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