1 | initial version |

Maybe sympy can be helpful;

```
sage: from sympy import *
sage: y,z=symbols('y z')
sage: from sympy.solvers import solve
sage: solve(log(z)+y*z, z)
[LambertW(y)/y]
```

2 | No.2 Revision |

Maybe sympy can be ~~helpful;~~helpful?

```
sage: from sympy import *
sage: y,z=symbols('y z')
sage: from sympy.solvers import solve
sage: solve(log(z)+y*z, z)
[LambertW(y)/y]
```

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