$$(5x-5)(2x+2) = 0$$
Answer
$$ \begin{matrix}x_1 = 1 & x_2 = -1 \\[1 em] \end{matrix} $$
Explanation
$$ \begin{aligned} (5x-5)(2x+2) &= 0&& \text{simplify left side} \\[1 em]10x^2+10x-10x-10 &= 0&& \\[1 em]10x^2+10x-10x-10 &= 0&& \\[1 em]10x^2-10 &= 0&& \\[1 em] \end{aligned} $$
$ 10x^{2}-10 = 0 $ is a quadratic equation.
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