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z in (-oo:+oo)
5*(z+1/5) = 6 // - 6
5*(z+1/5)-6 = 0
5*(z+1/5)-6 = 0
5*z-5 = 0
5*z-5 = 0
5*z-5 = 0 // + 5
5*z = 5 // : 5
z = 5/5
z = 1
z = 1
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