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j in (-oo:+oo)
j/3.87 = 7 // - 7
j/3.87-7 = 0
0.25839793*j-7 = 0 // + 7
0.25839793*j = 7 // : 0.25839793
j = 7/0.25839793
j = 27.0900003
j = 27.0900003
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