Question
$$(7a-1)^2 = 0$$
Answer
$$ a = \dfrac{ 1 }{ 7 } $$
Explanation
$$ \begin{aligned} (7a-1)^2 &= 0&& \text{simplify left side} \\[1 em]49a^2-14a+1 &= 0&& \\[1 em] \end{aligned} $$
$ 49x^{2}-14x+1 = 0 $ is a quadratic equation.
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