Question
$$2-1\cdot(13-(1+6)) = 0$$
Answer
This equation has no solution.
Explanation
$$ \begin{aligned} 2-1\cdot(13-(1+6)) &= 0&& \text{simplify left side} \\[1 em]2-1\cdot(13-7) &= 0&& \\[1 em]2-1\cdot6 &= 0&& \\[1 em]2-1\cdot6 &= 0&& \\[1 em]-4 &= 0&& \\[1 em] \end{aligned} $$
Since the statement $ \color{red}{ -4 = 0 } $ is FALSE, we conclude that the equation has no solution.
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