$$(5-6s)^2 = 0$$
Answer
$$ s = \frac{ 5 }{ 6 } $$
Explanation
$$ \begin{aligned} (5-6s)^2 &= 0&& \text{simplify left side} \\[1 em]25-60s+36s^2 &= 0&& \\[1 em]36s^2-60s+25 &= 0&& \\[1 em] \end{aligned} $$
$ 36x^{2}-60x+25 = 0 $ is a quadratic equation.
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