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