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j in (-oo:+oo)
j/8 = 1.4/4 // - 1.4/4
j/8-(1.4/4) = 0
j/8-0.35 = 0
1/8*j-0.35 = 0 // + 0.35
1/8*j = 0.35 // : 1/8
j = 0.35/1/8
j = 2.8
j = 2.8
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