# Translations:Faq/Calc/109/2/en

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The multivariable solver integrated into LibreOffice is activated by the Menu

▸ .The solver engine by default supports only linear equations, but the NLPSolver extension allows you to handle non-linear problems. You will find a full explanation of its functioning on [1].

Yous can also use the tool **Goal seek** :

- Set out the equations for your problem, with a cell to contain the initial value that is to be determined, and another containing the formula whose result needs to reach a certain value (the target value).
- Go to ▸ .
- In
**Formula Cell**, indicate the coordinates of the cell containing the formula which needs to attain the target value. - In
**Target Value**, indicate the value that should be reached in the preceding case. - In
**Variable Cell**, indicate the coordinates of the cell whose value is unknown and will be modified. - Click
**OK**.