$$ \begin{aligned}\frac{-x+6}{x-6}& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}-1\end{aligned} $$ | |
① | Factor both the denominator and the numerator, then cancel the common factor. $\color{blue}{x-6}$. $$ \begin{aligned} \frac{-x+6}{x-6} & =\frac{ \left( -1 \right) \cdot \color{blue}{ \left( x-6 \right) }}{ 1 \cdot \color{blue}{ \left( x-6 \right) }} = \\[1ex] &= \frac{-1}{1} =-1 \end{aligned} $$ |