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z in (-oo:+oo)
5*z+1/5 = 6*z+4/5 // - 6*z+4/5
5*z-(6*z)+1/5-(4/5) = 0
5*z-6*z+1/5-4/5 = 0
-z-3/5 = 0 // + 3/5
-z = 3/5 // * -1
z = -3/5
z = -3/5
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