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z in (-oo:+oo)
(1/2)*z = 2/5 // - 2/5
(1/2)*z-(2/5) = 0
(1/2)*z-2/5 = 0
1/2*z-2/5 = 0 // + 2/5
1/2*z = 2/5 // : 1/2
z = 2/5/1/2
z = 4/5
z = 4/5
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