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j in (-oo:+oo)
j/8 = 72/192 // - 72/192
j/8-(72/192) = 0
j/8-3/8 = 0
1/8*j-3/8 = 0 // + 3/8
1/8*j = 3/8 // : 1/8
j = 3/8/1/8
j = 3
j = 3
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