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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
1/8*z+1/5 = 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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