Question
$$-1 = -1+s$$
Answer
$$ s = 0 $$
Explanation
$$ \begin{aligned} -1 &= -1+s&& \text{ swap the left and right side of the equation } \\[1 em]-1+s &= -1&& \text{ move -1 to the right } \\[1 em]s &= -1+1&& \\[1 em]s &= 0&& \text{ divide both sides by $ 1 $ } \\[1 em]s &= \frac{0}{1}&& \\[1 em]s &= 0&& \\[1 em] \end{aligned} $$
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