```calc
q := 12 kN/m
E := 210 GPa
I := 8360 cm^4
δ(L) := 5*q*L^4/(384*E*I)
L := 5 m
L_max := root(δ(L) - L/360, L) = ?
δ(L_max) = ?
L_max/360 = ?
```

```calc
x := 1
root(x^2 - 2, x) = ?
x := -1
root(x^2 - 2, x) = ?
```

```calc
root(δ(L) - L/360, L, 1 m, 20 m) = ?
```