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z in (-oo:+oo)
(1/4)*z = 2/5 // - 2/5
(1/4)*z-(2/5) = 0
(1/4)*z-2/5 = 0
1/4*z-2/5 = 0 // + 2/5
1/4*z = 2/5 // : 1/4
z = 2/5/1/4
z = 8/5
z = 8/5
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