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z in (-oo:+oo)
5*z = 9/10 // - 9/10
5*z-(9/10) = 0
5*z-9/10 = 0
5*z-9/10 = 0 // + 9/10
5*z = 9/10 // : 5
z = 9/10/5
z = 9/50
z = 9/50
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