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z in (-oo:+oo)
1/5 = (1/8)*z // - (1/8)*z
1/5-((1/8)*z) = 0
(-1/8)*z+1/5 = 0
1/5-1/8*z = 0 // - 1/5
-1/8*z = -1/5 // : -1/8
z = -1/5/(-1/8)
z = 8/5
z = 8/5
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