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Z in (-oo:+oo)
1/8 = (4/7)*Z // - (4/7)*Z
1/8-((4/7)*Z) = 0
(-4/7)*Z+1/8 = 0
1/8-4/7*Z = 0 // - 1/8
-4/7*Z = -1/8 // : -4/7
Z = -1/8/(-4/7)
Z = 7/32
Z = 7/32
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