{\begin{cases} P_{k e r i s} = k S_{s a u n} Δ T_{k e r i s s a u n a s} \\ P_{r a d .} = k \cdot \underset{S_{m a j a}}{\underset{⏟}{9 S_{s a u n}}} Δ T_{r a d . m a j a s} \\ P_{k e r i s} + P_{r a d .} = k \cdot 9 S_{s a u n} Δ T_{r a d . & k e r i s m a j a s} \end{cases}

${\begin{cases} P_{keris} = kS_{saun} \Delta T_{keris saunas} \\ P_{rad.} = k \cdot \underbrace{9S_{saun}}_{S_{maja}} \Delta T_{rad. majas}\\ P_{keris} + P_{rad.} = k \cdot 9S_{saun} \Delta T_{rad. \& keris majas} \end{cases} \quad}$

Error