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z in (-oo:+oo)
z/5-5 = 3.1/3 // - 3.1/3
z/5-(3.1/3)-5 = 0
z/5-5-1.03333333 = 0
1/5*z-6.03333333 = 0 // + 6.03333333
1/5*z = 6.03333333 // : 1/5
z = 6.03333333/1/5
z = 30.16666665
z = 30.16666665
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